Hello C.! My name is M. and I feel for you hun. My first daughter Marilynn went through this as well. She was diagnosed at 10 days old with severe reflux and projectile vomiting. Also, the docs wondered if she had a milk sensitivity. So, this is what we did.
First of all, we religiously gave her simethicone drops before every feeding and at bedtime or naptime. That helped with the belly aches and excruciating pain. And you can buy this at Wal-mart...and you can get the equate version which is cheaper than the name brand. I think it's about 4 dollars. Best money I ever spent!
Secondly, we switched her formula from a milk based to a soy. However, none of my kids can tolerate Similac, so we tried Enfamil Lipil. It worked really great! We would feed her an ounce and burp her immediately. If she wanted more milk, then we gave her another ounce and burped her again. This is a lengthy process, but well worth it. That way her tummy wasn't overfull causing painful stomach cramps. And the milk stayed in her stomach.
Regardless if she was in pain or not, we gave her the Simethicone drops before each initial feeding. So, if you give your child a feeding of say 4 ounces, give your child one dose of the drops before the first ounce. These drops will help her/him to remove the air from the tummy and also aid in digestion of the formula.
Also, you need to tilt the head of the crib with wooden slats so that the stomach juices stay in the stomach and not in the throat which is very painful. And last of all, after the baby has eaten it's last ounce hold the baby upright for 30 minutes. This gives the formula time to leave the stomach and enter into the intestines...so the chance of reflux decreases. And it will also reassure that the baby is asleep and not in pain.
All of this information was given to us by our pediatrician and worked rather well. The good news is, this won't last forever hun. Marilynn is now 5 years old and is doing great.
Good Luck to you all!
M.