You could be having gerd (gastro-esophageal reflux
disease), or symptoms of an ulcer. Ulcer pain can cause pain in the back. Ulcers can be caused by or worsened by alcohol
intake. You could also be having inflammation
of your pancreas
). Your body seems sensitive to alcohol so you should minimize alcohol intake. Please see a physician to have your symptoms thoroughly evaluated. If you have increased pain, vomiting, vomiting blood
, or light-headedness, then you would have to be seen as an emergency.