What Causes Excessive Sweating While On Synthroid?

Hi, My name is Linda. I have been diagnosed with hypothyroid 2 years ago and started on Synthroid. I have recently, past three months, started being excessively hot and the sweating is just terrible. I have as of today reached the morbidly obese stage (245lbs). I have already travelled the menopause path so I know it is not it. To add on to that for the past 2+ years I have been severely fatigued. I changed jobs so that I would not be driving, however I am still falling a sleep on my job. Luckily mu supervisors are not aware of it. Oh yeah they gave me a breathing machine for at night thinking that would help with my fatigue and it does not!! Am I going crazy or is something really wrong with me???