The whole of your immune system relies on the lymphatic system for delivering nutrients, removing cell waste and keeping your cells hydrated and then empties into the bowel which has the highest concentration of lymph nodes. The lady who trained me in nutrition wrote a book explaining how critical this is to address, it is called "cellular awakening" and you can get it on amazon, you would find it a useful aid.
All illnesses and symptoms will not improve unless you address lymph flow and cleansing. All of your symptoms you describe indicate a very high level of toxicity in the cells even before you took iodine. You certainly don't need to pay someone for it. I have already explained what you need to do in previous posts. You really need to stop fixating on your thyroid - it is very sensitive to toxicity so it is a symptom of your problem, not a root cause.