Why do I have nausea, cramping in upper groin area and burping?

Hello doctor,

I had nausea a year and a half ago. At that time, I could not eat and was given IV therapy along with antacid. Immediately felt better and I left the ER. I had a colonoscopy about a year ago and it was fine. Doctor did not do any other test and said I had gastritis from alcohol. He gave me some nausea medicine. Recently, I went to my doctor with symptoms of bloating gas, belching, lower abdominal cramping and nausea. I had been drinking pretty heavily for the past five months. I have not been vomiting nor had any blood in my stools. It has been two weeks since I consulted him and I am still belching, having cramps in upper groin area, and burping. My appetite is fine. I have not drunk for17 days now. I am taking Zoloft. What is your suggestion? Please help.