Acute pain in stomach after drinking a glass of water?

Gastritis. Do you take any medicines like Aspirin, Ibuprofen or Aleve (naproxen)? Do you have Heart burn? You may try Tums, ( which is calcium) or OTC Pepcid AC or Omeprazole for a few days. If pain continues bring to your doctor's attention. Do you have trouble swallowing mainly liquid? or Cough or chock? If so you may have Dysphagia, and need to find out more about your swallowing Ability by social test.