calorie count. hyperthyroid.?

I am beginning to wonder if I am doing something wrong. I am two months out (as of yesterday) and I am down 64.5 pounds (as of this morning). I keep track of my diet (very strictly at that) on fitday.com and it appears that I am hardly bringing in 400 calories a day. 200 of these calories are from my protein shake (which has 40g of protein). my carbs are under 30. I am losing weight on a daily basis (one plateau at 4 weeks and it lasted about a week -- then I lost 10 pounds!). I am drinking about 3 liters of water a day. I exercise 3 days a week plus some strength training. ok, so now you ask: well, what is the problem? I feel terrible. I can hardly sleep (and I never had a sleeping problem.. I was one of those people who could put their head down on a pillow and ten seconds later --*poOf* asleep!), I sweat like it is mid-august in Texas (and I currently live in Norway!), I really have to force myself to eat, and oh, I am exhausted. I get a good 4 hours a day that I do not feel like death warmed over. my pre-op blood worked showed I was hyperthyroid (which I have not yet been medicated for). is it my imagination or am I paying too high of a price for weight loss? or I am just doing something wrong?

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