This is me almost to a T. I never threw up, but yes to everything else, especially the yawning. That is due to 'air hunger'--the feeling of not being able to get enough air in the lungs, or to get a satisfying breath in. It felt like spasms too. I couldn't lay down or it would make it so much worse! I now sleep with my bed elevated by bricks underneath the top posts. I hate going out if town and sleeping on a flat bed, it's miserable! Even now that im 'cured', i still need my bed elevated. Please read this article, and DO NOT get meds (Nexium, etc.) for your son. (I didn't have H. Pylori OR a hernia.) I was on meds for many years and had a good long period where they worked for me. But the reflux came back. I would follow the 'diet' perfectly, and the reflux always came back. I'd try a higher dosage, a different Rx, a combination of two Rx's, yet still, it wouldn't get resolved. Finally I started receiving Dr. Mercolas newsletters (my mom thought I'd be interested) & came across this information that turned it all around for me.
http://articles.mercola.com/sites/articles/archive/2009/0...
I also read other ways to increase stomach acid & found some info on Apple Cider Vinegar. (I thought it was from Dr. M but it wasn't...)
I weaned myself off the meds & started taking apple cider vinegar. I got the organic kind with the 'mother' (from HEB, it will say 'with mother' on the bottle). It was so disgusting I could barely drink it, but I forced myself to because I was so miserable. Then, I tried it with baking soda, and it was so much better!!!!!!!! I thought it would make it taste worse, but I was so wrong! ;) I drank that for about 10 days, about twice a day, then cut back to once a day and then every few days. It has been a WHILE since I did that & I feel so good! I also changed my diet and quit eating all grains, beans, potatoes (The Primal/Paleo diet), but even if your son doesn't do that, I know the vinegar will help. Please have him drink it, it's only a tiny amount (2T of ACV + 2t baking soda and abour 2T of water, but maybe your son won't need that much). When i cheat on the diet i have to take a dose of the ACV again, but one dose is all i need. The meds won't cure him, but I really think the ACV will. Have the doctor check him for H. Pylori, and for a hernia, but get started on the ACV right away. Good luck! Let us know how he does :)