FSH is high, get testes examined looking for testicular cancer. In any case, you have primary hypogonadism.
You have many topics so I can’t see what we had covered before, not going to make that effort.
High dose iodine increases TSH, harmless.
Concern with iodine would be if you had thyroid autoimmune disease and you did not test for thyroid antibodies.
200mcg iodine is what you should be getting anyways.
You need 200mcg selenium from vitamins and those might then have 150mcg iodine.
If you had not been using iodized salt, that may be the cause of your thyroid problems.