Sorry if this is too many questions, but are you seeing an endocrinologist, or just an internist? Did she suggest the 150 mcg or did you just want to try it? Are you taking your pill with food, or without? Are you taking birth control pills, and if so, at the same time as your thyroid pill? Are you eating a lot of soy-based products or other goitrogenic foods? Is the level you're referring to TSH or some other measurement?

Hope you feel better soon!