Hi I Am Suffering From Hypothyroid My First Thyroid Report

Hi I am suffering from hypothyroid my first thyroid report was TSH 15.2 and T3 T4 was normal My Doctor has stated my treatment by giving me Thyroxine 50 mcg and increased UpTo 88 mcg and then my thyroid profile becomes normal.
Now I am facing the problem of excessive sleepiness, in morning I took medicine and whole day I feel sleepness .
I have takeing 88 mcg Thyroxine since last 20 months.
What I do now to get rid of this sleepiness.