Nina,
You won’t “suddenly” be hypo thyroid, because you will have all that extra thyroid hormone stored, but it is quite likely that you will be sent home on replacement hormone.
The iodine in IV contrast is different that iodine drops.
Hopefully, others will post about their surgery. You can also get some information at the Thyca.org site. That is for thyroid cancer survivors, but the surgery is the same. We work closely with them.
Nancy
“nancyngdf@bellsouth.net”