Any Success stories w/ Woman Wit Thyroid?

I was diagnosed with hyperthyroidism when I was 5, I was being seen by a doctor every 6 months & had blood work done every time I went in. In 2009 my doctor said I was a set that the thyroid was normal. Then I started to gain some weight went from 135 to now 172ish & I'm really ashamed & embarrassed to go out to the beach. I mean I'm not fat I just have a belly but I don't like to show it . Anyway, I just got tested again & the ultra sound to my glands showed my left is bigger than my right side one. so I'm taking synthroid 25mg now to see if it equals out . But we have been trying a& still nothing . I'm started to think it's me that can't carry babies. & it's very upsetting. Does anyone have any suggestions or tests we should do, or have succeeded having kids with thyroid ?