iodine exposure

Has anyone had trouble with exposure to an excess amount of iodine with
their tank and had thyroid problems because of it? Has it been documented
anywhere? I regularly dose my tank with iodine for my xenias and put my hand
in the tank frequently. I have recently found out that my Thyroid is putting
out too much. Thinking that this may be the reason.

Does any one have thoughts on this or information that could help me. I just
had a ultra-sound on my thyroid. Looked it up on the internet and tried to
figure out where in the world I could be getting iodine from except from the
occasional vitamin I take and then it hit me. "MY TANK" Duh!

If anyone can shed some light I would appreciate it.

Thanks,
Paulette