Suggest Dosage For Thyronorm

I was diagnosed with hypothyroidism on 20 Feb 2015. T3 - 0.19(.5-1.8). T4- 3.81(4.4-11.6) & UTSH -14.60 (0.4-6.16). I am taking thyronorm 100 and all levels were normal after 3 months. I am still taking the same dose everyday as advised. But I am facing dry brittle hair...hair loss...drowsiness...low energy.. last month I had my periods for31 days. Went to the gynaec after 10 days and medicines didon t seem to work. Finally gynae cvp worked. All USG reports normal....no fibroids or cysts. I weigh 80 KGS and I m 5 3. Could this be due to overdose of thyronorm ? I am unable to work because of low energy...I m a training professional. My brains r also working on a low level. Thanks and Regards.