my son was diagnosed with acid reflux as an infant

Hi! I am a mother of 1 child who is 21 months old, and was diagnosed with acid reflux as an infant. He had symptoms of throwing up after only a couple ounces of formula, gas, tummy aches, and drooling very badly before and after feedings. Our pediatrician prescribed zantac for the acid reflux. I was actually shocked that they said he had acid reflux. We had tried different formulas, but it seemed as if nothing was working. I thought my child was colic, so I read all about colicky babies, and it seemed he very well could be colicky. So we tried the zantac, only to find that it only made his symptoms worse. After only 1 dose of the medicine I called the pediatrician and she told me to stop giving him the zantac immediately, & so I did. I have thought that maybe he just spit up more than other babies, and was just a little crankier, until after he turned a year old and we gave him regular milk. He was on lactose free formula as an infant, and the doctor said it would be ok to try whole milk since how we didnt think it was the formula causing his problem.  We gave him whole milk until he was about 15 months old and he started getting diahrea. He would have up to 5 or 6 diahrea diapers a day so I called the pediatrician again and said to try the soy milk again. He has been on soy ever since, and I am still dealing with the same issues he had as an infant now, and more issues. Now at bedtime almost every night he gets upset and forces hisself to vomit. Is this normal for a toddler to do when he is upset? When I go in there to clean it up, it's usually not even his dinner he just ate, it usually looks like his juice he had at dinner time or just a clear or yellow liquidy like substance. I am a new mother, and am open to any advice that anyone can give me. Could all of this be linked to the acid reflux as an infant, or is it just a phase he is going through. He is an extremely picky eater, he has a constant rash around his mouth, he is cranky alot, and has extremely soft stools (even on soy milk), and is hard to get to go to sleep, even after the same bedtime routine his whole life.