While my baby boy doesn't have reflux, he is sensitive to things that I eat and will spit up A LOT depending on what I eat. After doing some research and some tests with my son and seeing what makes him spit up, I've discovered some things that I have to avoid if I want him to stay happy after nursing him.
I have to avoid all chocolate, any carbonated beverages, anything with a lot of sugar in it, broccoli, cauliflower, beans, and while I can have milk, it has to be only 1-2 servings a day.
Since my son also had some bad episodes of spitting up before I figured out what he was sensitive to, I would put him to sleep in his bouncer chair, since that keeps him more upright. That helped a lot. I've also heard that if you raise one end of your baby's crib, about 30 degrees, that will help too. So will holding him upright for about half and hour after feeding him.
Good luck and hopefully your pediatrician will be able to help you out.