E.,
I can empathize with your worry and frustration - my son is now 4 but he had terrible bouts of throwing up and discomfort/unhappiness as an infant. I did not ever give him either Zantac or Prevacid, though I did occasionally give him small amounts of liquid antacid like Tums with a dropper. What I really found to help, though, was doing an elimination diet. I was nursing, as you mentioned that you are, and learned that in many cases what is diagnosed as acid reflux in nursing infants is actually a food allergy type reaction that the baby is having to something in the mom's diet. You may have already done this, but dairy is #1 on the list to cut out of your diet. If you do not see an improvement, you can also try cutting out other common allergens, such as nuts, eggs, wheat, etc. There is a lot of good info online about elimination diets if you decide to try it. I really found it to help, but it was hard to do. I lived on rice and water and veggies for a little while, until I could start reintroducing foods to my diet. It was worth it though, my son improved very quickly and he is practically allergy free now that he is older. Another benefit is that I lost a lot of baby weight while on that diet! I would be glad to answer any questions that you have, and I wish you the best. I hope that you will continue nursing as long as you can, even if it seems hard to do, it is really the healthiest choice for your son and for you.
A.