I am taking levothyroxin 100 mcg one tablet per day since last seven months , now my thyroid level is in range, but I am feeling heaviness in center of my head, slight dizziness and some time on bed during night time , I feel numbness of my hand , arm etc, back of my neck is also paining , my neck feels pain, some time I never sleep at night due to this symptoms, I checked my thyroid last week, it was in normal range. I am feeling these symptoms since last 2-3 weeks, these symptoms are off and on. I am worried much . Please help me, my age is 35 and I am female, last two months I got heavy periods.