Kelp contains iodine. if you are deficient in iodine then fair enough you need to take supplemental iodine in some form. Although personally I'd prefer to take Lugol's or some other form of iodine intended to be taken as a supplement, rather than kelp.
But I would be surprised if you had had a test to find out whether you are deficient in iodine. Very few people get such a test done. And when people do test they are often advised to take the iodine loading test which shows over 90% of people are deficient in iodine. It is a bad test. See this link :
The problem with supplementing iodine in people who are not deficient is that it revs up the production of thyroid hormone in people who may already have a suffering thyroid. It is a particularly bad idea to take iodine if you have autoimmune thyroiditis.
Autoimmune attacks on the thyroid will eventually destroy the thyroid. Add iodine to the mix and it speeds up the destruction.
You really need to find out whether you have an iodine deficiency before taking kelp again. And avoid the loading test.
When you've had some time to get the kelp out of your system, you should have a complete set of thyroid function tests and nutrient tests done, if at all possible. If your doctor insists on doing just TSH he/she can leave you very ill.
If you can afford to get a private finger-prick test done, then post the results on here in a new post, we can help you on the road to feeling better.
Blue Horizon (BH) :
Medichecks (MC) :
BH offers vacutainer kits (for taking a sample from a vein in the arm) as well as finger prick kits, but you have to arrange for someone to take blood for you. It can be arranged at a price in various ways (including through BH), but if you know someone who can do it for you then you may find that easier than the finger-prick testing.
It is a good idea to ask your surgery if you can access coded information from your medical records online. If you can then you need to show some proof of identity, and get some codes from your surgery which allows you to register.
If your GP doesn't offer this service (many of them are dragging their heels on this), then ask for copies of any blood tests results from the last 2 or 3 years. You need to make sure the reference ranges are included. You will need to show proof of identity when you ask and when you collect any print outs. Receptionists have to ask a doctor's permission before supplying information from medical records so expect to get the results the next day, not at the time you ask.