Acid Reflux ? ?

One of my good female friends is 18. For a year or 2 she has been having trouble and doctors can't figure out exactly what it is. Once or twice a month it seems like she is getting very sick for a day. She said she has pains from her stomach up towards her chest and at times they are very sharp pains and she can't lay down or get comfortable, the only comfortable position sometimes is to get in a ball laying on the ground. She also complains of having a "wet feeling" in her mouth like she will vomit and at times she thinks she will but rarely does. The last time it occured it started during the middle of the day and got worse as the day went on and she was up until 4 in the morning trying to sleep and couldn't get comfortable either. The whole time she is crying complaining that she doesn't know what to do. I have read up on acid reflux and it seems like this could be it but I dont know what to tell her or how to help her out.