Hi,
It seems to me you are a regular drinker, so more possibilities of pancreatitis but the other regions of left abdomen are diverticulitis, constipation, urinary tract disorders, cystitis,
ulcerative colitis, Crohn disease,
irritable bowel syndrome, kidney stones,
transverse colon volvulus, pancreatic cancer, pneumonia,
kidney infection, food poisoning, bowel cancer, abdominal aortic aneurysm, gastritis,
spleen infection, hernia, and psoas abscess.
Left side abdominal pain is caused by those organs which are situated on left side of abdomen or apart from these so many organs are left side of abdomen like spleen, large intestine, pancreas, left kidney, heart, left adrenal gland, but to rule out the cause of pain firstly you must have to get done the ultrasound and x-ray.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Ankur