I would stick to a liquid diet, hopefully that will help the gut settle down. As for the nerves there are some natural things you might try, such as Valerian or St Johns Wort. I would suggest you also take a probiotic, that will keep the bacteria level at least.
Can you get in to see one of your other doctors? You need to have some kind of treatment and this guy is being a jerk for not helping you at all. I will definetly keep you in my thoughts and prayers. Good luck!