Generally,I would say that you don't need to get any vaccinations for the places you are visiting. I certainly wouldn't bother, but you should check with your doctor as it's a personal condition.

There are plenty of non spicy foods in Thailand, especially some of the noodles soups, sweet curry, fried rice etc. Just read the menu carefully and be sure to mention to the waiter/waitress that you want completely non spicey or "MAI PHED" in thai. I've never had a problem.