My doctor said the liver can't feel pain and that it was probably a gastro problem and sent me to a gastroenterologist. I have GERD and am currently taking Prilosec for it. One last thing you should know, I have been known to drink rather heavily. When I don't drink the pain is a little better but certainl not good. This stretching can occur when there is inflammation of the liver or if the liver is enlarged.
Alcohol use can cause an enlarged liver by fat infiltration.
As the other respondents indicate alcohol can also play a role in the development or exacerbation of other gastrointestinal problems e.g. GERD, ulcer disease. I agree that you should stop the alcohol. If stmptoms persist, additional testing may be needed. This information is presented for educational purposes only. Always ask specific questions to your personal physician.