Are there foods I should avoid?

I don't know if I am hyperthyroid or not but I have been doing some reading on symptoms and such and I have a lot of them. I still have to make an appointment to see the doctor. Anyway, I was just wondering if there were certain foods to avoid? Has anyone cured themselves? I've done many cleanses in the past but I am certainly overdue. I had a baby almost 2 years ago and am still breastfeeding him so it's going to have a wait a little longer but thought maybe I could change what I eat now. Any suggestions you have would be great!! Thanks!

Nicole