Can too much Levothyroxine/Synthroide make your thyroide level go down?

I have was diagnosed with Hypothyroidism about 5 years ago. My dr had my on brand snythroid until about a year ago. I have had tremendous weight gain, unbelievable fatigue joint pain, ( i also have osteoarthritis) terrible sweating when I do any kind of excersion at all. (even vacuming and my face gets so red, and I sweat so bad that my clothes a soaked). I saw my endo about 6 weeks ago and he increased my med from .200 to .400 mcg daily. Now I have been having terrible bronchitis, then pneumonia, and horrible shortness of breath, to the point that I feel like I am going to faint. My arms and legs feel like they have weights attached to them, making it almost impossible to even wash my hair in the shower.My internal med dr ran some blood tests and he said that my thyroid levels were horribly low & that I was taking way too my thyroid medicine and that I needed to lower it because it was making my levels too low. I didn't understand that since I have HYPO NOT HPYERthyroism. I have been so sick that I have missed almost 3 weeks of work. My dr told me that it was going to be a while before I felt better. Great Just what I wanted to hear. I am lost, and could use any help anyone one out there could give, also, could anyone explain to me what a STORM is ? Glad to be here! Leighler87