I am going through the same thing right now...my thyroid bottomed out again...I am exhausted, panicky, and a headache...I also was put on antianxiety drug and given xanax which takes the edge off but I am so tired...I take synthyroid .15 mg ..It is a real pain..I wish you luck..Mary
The lethargy, panic and memory problems are probably related to yur hypoT. Migraine may or may not be.
What was your TSH before treatment?
You should be having follow-up blood work right about now. Most docs recommend a TSH around 1, no more than 2, if you are taking meds.
Is it generic or brand name levo?
The symptoms will slowly resolve in time. Some quicker than others. It took me a few months on the right dose to feel very good. I felt ok in a couple of weeks.