www.refluxrebels.com
www.marci-kids.com
Sounds like it could possibly be reflux. These websites have tons of info, and the RR site also has a link to a community forum of awesome mom's that have LO's who have/have had reflux. My LO has reflux, though he is now med free. He went undiagnosed for 4 months, and it was pure hell. His old pedi said it couldn't be reflux since he was gaining fine (he was 20 lbs at 4 months). She ignored me when I said he spit up, choked, spit up in his sleep, cried non stop, wouldn't lay flat and always wanted to be held upright, had frequent painful hiccups.... I wish I had changed dr's sooner, so he didn't have to suffer so long. We tried Zantac, it worked for only a week. LO's quickly build up an intolerance to it since it's an H2 blocker. PPI's (proton pump inhibitors) are much better at treating reflux. Prvacid Solutabs worked for my LO's reflux, but gave him insomnia. Nexium is what finally worked with no side effects. He's been med free now since 8.5 months (he's currently 12 months). The above sites have a list of reflux meds, as well as more info about them. I think the best thing you can do as your child's voice is to read up and know what the treatment options are, and talk with your dr about what is best for your LO.
Untreated, and also undertreated, reflux can do damage to the esophogus, and cause other problems. I would encourage you to talk more with your dr, as well as learn all about AR/GERD yourself, and find the best treatment for him.
Reflux can also be caused by an intolerance to dairy. So whether he's BF'd or FF, that could be aggravating it. The RR site also has more info about this. If you change your diet, you can continue to BF. Although my LO just had reflux, and changing my diet didn't help at all. I know for many it does help tremendously, though.
He also started wearing an amber teething necklace at about 8 months. Within 2 weeks of wearing it he was med free. Hazelwood is what's supposed to help ease relfux pains, but the amber has worked wonders for my LO. www.inspiredbyfinn.com is a great site to read more, and they also have info about hazelwood.
I hope you find some reflief soon for your LO! (((hugs)))