I have serious anxiety issues and my heart rate is 90-100 normally. And I can't tolerate heat due to which I sweat much more. For the past 3-4 months I am not able to sleep well. I wake up after every 2-3 hours and it's hard for me to sleep no matter how tired I am. I have done Vitamin B12 test and thyroid tests. Vitamin B12 is 121 pg/ml which is well below normal range. And my T3 and T4 are in normal range but my TSH is 6.3 mCu/ml. The symptoms are of hyperthyroidism but that's not the case I am assuming. My physique is very good and I don't have fatigue or muscle weakness. I do have 2 head injuries on my forehead since I was 12-13 years and I think these injuries have affected my brain chemistry making me more anxious and that's how all these other symptoms came. What could be the case? What can I do about it?