It's no wonder with all the carbohydrates you are consuming. Vegan CAUSES GERD. Your stomach needs more complex foods (especially proteins).
I would advise a diet consisting of a balance between protein rich vegetables such as beans and corn, and leafy green vegetables. I would suggest whole grains such as whole wheat, brown rice, and ...
Just go to your nearest natural and organic food store. They will have vegan recipes for you to get.