It sounds like you have Hashimoto’s. Ask your endocrinologist to test your TPO Antibodies next time you have your blood drawn, along with TSH, T3-free, T4–free. Also, a book on Hashimoto’s by Isabella Wentz, M.D. is worth the read. I read her book and pretty much healed myself with eliminating certain foods like gluten, dairy and soy. You will be amazed! I also suffer from hypothyroidism and take 75 mcg of Synthroid. I too was gaining weight by the day and was doing the Weight Watchers Weight Loss Program…I knew something wasn’t right.