you took it by accident? so, you did absolutely no research, consulted no doctors, took no cosupplements... and just randomly ingested Iodine by accident? could you have bought a bad/wrong batch by accident too?
or could it be whatever is causing your gut to swell after oil pulling? you really don't know. 4 months is a long time to be putting the blame on one thing.
either way, there's nothing you can do but wait it out and try to detox. or find out what is really making you sick.