Re: sea salt
I use a lot of salt---mortons non iodized was my choice, I didn't restrict that at all.
I ate chicken soup, and chicken cutlets when I got very hungry-with a big salad, with oil and herb dressing--to make cutlets I used something called "matza meal" a crushed matza for the bread crumbs, and egg whites, and olive oil.
You should definitely get a letter, in case at one of the airports they have any sensitive radiation testers (they have these in NYC, so I kept a letter with me).
Also, my state (NY) requires a consultation with a nuclear safety person, you should ask your hospital to arrange one, I found it invaluable to figure out what I could and couldn't do, and when.