I don't know what's wrong here!

You need to have your thyroid levels checked asap

Well muscle does weigh more than fat does. So thats going to impact your results. But you should see a doctor ASAP. Those symptoms don't sound normal.

The symptoms may just be side effects of your diet, it is quite common for people to suffer from hair loss and headaches on very low calorie diets. That said a blood test for nutritional deficiency might be a wise move.

If you are doing 600 cal workouts every day, then your really on a 900cal/day diet, which is quite extreme.

Looking at your food diary there is very little protien, from what I have heard you need more protien when trying to build muscle.

I second getting your blood work checked. I have same symptoms, hair loss is SOOO bad I clog drain every 4 days or so. However by levels were all normal according to Dr. tested: T4, free T4, TSH, and complete blood count to check for anemia and such. I notice an incredible difference when I add 2 protein shakes a day adding 50 grams of protein in each shake. 240 calories per shake. I can barely reach my 2000 calories a day with just food. I also work out 1-2 hours a day, 6 days a week. sound odd, but eat more