What thyroid are you using and also what kind of food makes up the 3400 on low fat days?
Haidut's Tyronine during the day (~16 drops on forearms or ingested) and Tyromix at night (1 drop on forearm).
Generally, 1600-2000 calories of OJ, milk, gelatin, and sugar, which I drink throughout the day. Then, a home made dinner with little to no PUFA (lean beef + some starch, often rice because I have a family and I don't want my wife to kill me). I'll have a soda with dinner if I think it's protein heavy. Generally have a sorbet for dinner, store bought but with few to no additives. I should make my own, but I don't have very much time.
Fat is creeping back in. For instance, we'll make some oxtail soup over the weekend and I'll eat that sometimes. I do try to have a carrot salad with hydrogenated coconut oil, salt, and vinegar, but probably only manage to do that every other day on average. We try to have cooked mushrooms all the time.
After the trip, I got constipated pretty badly and I've stopped the gelatin since that was pretty low on the trip. I brought a green can with me, but didn't have it consistently. Things have returned to normal, so I might get the gelatin back in, the two days that I've skipped it my protein is a lot lower. I've been up around 160g/day, now down to about ~100, which seems pretty low for 3-3.4k cals.
I'm mostly feeling better, but my energy is still pretty low compared to when I started peating in December. Sleep has been disturbed a lot for the last two weeks due to work and family travel, and the 3.5 year old keeps waking me up too, so that might be the cause of the energy decline the last few days.