I lost weight from Febuary-June then had to get rid of all artificial sweeteners as they were stalling me (and even making me gain a couple of pounds). Since Oct 18 I had to stop all Dairy (except butter) too. Maybe you could try eliminating both of these things for a while and see if it helps you. Many others on the forum have mentioned both artificial sweeteners and dairy causing them issues of stalling or weight gain as well, so if you tried getting rid of both for a bit, maybe it would help you too? =). I agree about sneaky carbs, that is the reason I track daily.
I use a free program called cronometer.com and it works great for me. Best wishes in getting it all figured out, whatever you decide to do =).