Two time Cancer survivor, hypothyroidism

Nicki
Hi! My husband has beat cancer twice, and now has hypothyroidism. We are TTC, but haven't been successful. Does anyone have any experience with stuff like this?! We want a second baby so much! He's had a SA done, and the results came back with no sperm. But, we were also told the Hypothyroidism could have something to do with it....definitely feeling confused and discouraged!