lol at your doctor, she's definitely being a bit over cautious for you there. I think even if you are on a 2 week holiday it's fine, unless you have a weak stomach or something. You're just missing out on some really nice food. I think even if you really try to avoid the 'dodgy' food and the tap water then you will still have an slighty upset stomach for a day or two, everyone seems to in my experience.
And I can't imagine a day without 10baht fresh pineapple !