Hi. I started keto 3 weeks ago and got through the keto flu etc. ok and have lost a total of 10 lbs so far (I know that it’s probably water weight). But the last few days I’ve felt extremely tired with mild headaches which I experienced before keto and it had stopped after the lifestyle change. I don’t know what’s happened! I’ve been getting 11/12 hours of sleep lately and I normally get 9/10! I haven’t changed anything; eating under 20 net g of carbs, not paying that much attention to calories, eating clean and getting 6 portions of mainly vegetables a day, drinking when thirsty etc. If anyone knows what’s happening or has any advice it would be greatly appreciated. I’m always happy to provide more info. And I’m sorry if this post doesn’t make any sense but I am literally falling asleep whilst typing this at 3pm!!
3 weeks in and so tired
Good, I add salt to my food and water and I will take electrolyte if I feel I need them. I can normally tell with my body
Are you tracking them with something like Cronometer - what looks a reasonable amount to the naked eye might not be enough. Are you also getting enough fat & protein? You say you’re eating mainly veggies.
I haven’t been tracking actually that’s a great idea! Is there an app or something??
yeah I’ve been tracking and I’ve been going over my protein macros as well!! A lot of cow has been consumed recently!!
There’s always an app 
It’s super helpful to track when you first start - after a while you can usually return to eyeballing.
Ok so turns out that the app I’m already using tracks sodium and potassium 
currently I am going over my sodium (2000 mg a day) but am way under my potassium (900 mg a day) any tips to get more potassium?
Sodium requirements are actually a lot higher on keto so you’re still under salting I’m afraid - apparently we should aim to get between 3000 - 5000 mg p/day. Potassium can be found in many keto friendly foods - avocado in particular - but there is also a product called lite salt that some people use to make ketoaide. I find I don’t need to supplement potassium but I do need to keep my sodium & magnesium up.
OK, so I think you’re tracking 
Are you eating enough energy-wise? A common mistake is not eating enough/eating too many veges (old habits).
Yeah been hitting all my macros and on 1700 calories a day which is my BMR as not doing much in the way of exercise recently. When I do exercise I eat my exercise calories also as I don’t want to be in a deficit until I’m all keto adapted and what not
I felt immensely better after the first 3-4 days. It’s different for everyone, of course. But fats. Get fats. Veggies are meant to fill in missing nutrients and fiber you don’t get from nuts, seeds, avocados, etc. They shouldn’t be a large part of your diet. You should be stuffing your face with healthy oils, cheese, butter, and try a bulletproof coffee which is 1-2 tbsp of MCT oil, coffee, and 1-2 tbsp of ghee (or reg butter if you prefer).
Don’t be afraid of eggs, sausage, bacon, fatty fish, pecans, walnuts, and my absolute fav is Walmart brand 90% dark chocolate. It has 1 net carb. One!! Five carbs with 4 grams of fiber. (Just in case you don’t know carbs - fiber=net carbs. Those are what you count towards your daily count. Some will count all carbs toward their daily goal, though.
Also chia seeds and ground flax seeds are great sources of fiber and nutrients that have zero carbs as well. You may need to lower your carb intake. While some can handle up to 30 carbs, some can’t. I started at 25. I’m down to 5-10 a day and feel much better the lower I got. Find those fiber rich, nutrient dense foods that net low carbs. That’s what I did, and it really did change the energy I had.
Edit:
My info and macros are:
125 lbs, 5’7, active, using ketosis to control epilepsy
Calories - 2000-2500
Fat - 200
Protein - 90-100
Carbs - 5-10
I am also on medication for my seizures. I just have a hard time controlling my epilepsy 100% with medication alone, so that’s why I also do keto.
The medication I take controls them for the most part, and I haven’t had a convulsive seizure in 3 years, only ones where I space out for a few seconds. So I can’t do things like drive, or anything that would put me in danger if I lost control of myself for a moment. But other than that I don’t have to worry too much if I fall out of ketosis by accident, because most likely my medication will take care of things if I do.
But also, I don’t allow myself cheat days. Some days I’ll hit my 10 gram carb limit. I consider that a special day. I usually limit myself to 5. I stay pretty strict. I also have OCD coupled with an eating disorder, so my ability to track, plan, and manage my food is pretty great.
Also, and I know this is getting long, I will say that this diet has helped me with my eating disorder and other mental issues. It helped me see that food was not my enemy, that being a healthy weight was a positive thing. And the mental clarity it brought has helped me tremendously. I’d recommend it for those with other mental disorders just for the anxiety relief and general feeling of peace that it’s has brought me mentally and emotionally. It’s a side effect I didn’t expect.
Recent studies, including the PURE study out of McMaster University, have shown that we are at our healthiest when we get 5000 mg of sodium a day, which is about 2-1/2 teaspoons of table salt. If you get enough salt, it will keep your potassium, magnesium, and calcium properly regulated, as well.
The U.S. guideline for sodium intake is woefully low, because it is designed to help the less than one percent of the population who might actually benefit from reduced sodium. It seems the rest of us are supposed to suffer sub-optimal health, because we are all apparently incapable of understanding that not everyone needs to worry about their salt intake.