I think I may have a chronic digestive problem or something of that sorts.?

I am 18 and male, I am almost exactly 6' tall and weigh 125-130. I have always been and looked really really skinny. I can't eat in the morning or I'll get sick. I really don't get an appetite till around 4 P.M. and it will grow from there. I can eat the most around midnight. I have acid reflux like problems (lots of gas, i can burp and fart all day long and it won't feel better) and antacids seem to barely help. I have been to doctors and they just keep throwing antacids my way. I am pretty anxious and will shake a lot and I believe there is a correlation between me shaking and my digestive process. After a big meal, my leg will shake almost uncontrollably. I get nauseous fairly often. It has gotten worse recently with increase gas, stomach pains, and irregular bowl movements.I also recently threw up undigested food from which was in my stomach a good amount of time before I threw up. My mother thinks its hypoglycemia, but it is my impression most hypoglycemics are also diabetics. I have been told about celiac disorder which seems possible. Any suggestions???