I just realized that my zantac (an antacid and histamine 2 blocker) has probably been interfering with my thyroid medication and causing it to lose its effectiveness. This could explain why I've been feeling so hypo!
I'm going to start taking my zantac at least 4 hours after I take my thyroid meds in the morning. Sigh. My Dr. didn't tell me these could interfere with eachother, I just happened to see it on the internet.