Don’t waste your time with elimination diets, TEST! It’s unlikely you’re actually intolerant to a huge list of foods, way more likely your gut is screwed and one thing triggers the next. The days of elimination diets are outdated, we have labs for that now. A foods sensitivities test will show you immune responses to food, and how severe they are, and a stool/biome test will show you what your digestive system is having issues with. I’ve brought back my gut from the brinks of hell and now have no real issues vs a couple of years ago when it was terrible, things that flagged bad on my food sensitivities don’t any more and my bloating is gone unless I eat stuff I know my body doesn’t like.
You can do a food sensitivities test at home and send to the lab, same for a stool testing. You can buy both of them with HSA/FSA money and have a LOT of answers right up front and save yourself a lot of hassle and wasted time.
Also, don’t play around with chronic constipation, when I ate standard Keto I did just that for 4yrs, I believed the I didn’t need fiber thing, and now have some permanent damage thanks to that which I wouldn’t have seen except my doc got pissed and ordered me a colonoscopy. Put fiber back in and within days I was going normally again.
There’s a lot of stuff you can do to start the repair process, depending on what you find out. For brain energy there’s also a ton, really depends on you and what you’re into doing.