2 months ago, i was having low temperature max 98°. i was feeling drowsiness, mental fatigue n sleepy or u can say lost somewhere. I thought may be due to hypothroidism but thyroid test was normal. After taking homeopathy i was alright.but right now i still feeling the same condition, please tell me what to do. When i starts to study i just feel i unable to concentrate, remind concepts or learn anything and feels low n sleepy.  im also taking homeopathy for hair fall, follihair tablets, d3 6000 UI  tablets.please tell me medicines to be taken..