Hey Jen,
I have been taking synthroid for almost two years now. My symptoms were dramatic weight gain, feeling cold all the time, feeling confused and really tired. It took about 6-9 months to get the dosage correct but now I'm doing fine with it. I'm back down to my normal 122 (from 158!!) and as long as I continue to take my medicine I feel fine. The pills are tiny, no issues taking them, and they cause me NO side effects. Until I started taking the medication, I didn't realize HOW MUCH the effects of the underactive thyroid were having on me. We tend to adjust to our bodies at times. Once I started the meds and got them straight, I notice a big difference in myself if I miss a dose. When we went away for a week, I forgot my medicine and boy was I feeling it by day 5. Get it checked, if you need the meds, know that it's a simple fix.