Am not able to eat. pain in top of stomach ?

Need more info: If you mean you cannot eat anything at all & are vomiting, you should see Dr very soon. If you mean appetite is down & don’t feel like eating & have pain, you could try antacids &/or famotidine for 1-2 days & avoid alcohol/aspirin/anti inflammatory meds/acidic foods & see if helps. Drink small frequent amounts of clear liquids. If pain worsens or you have fever or vomiting see Dr

Pain: The cause of the pain and inability to eat has to be determined to then choose the appropriate treatment. You must be physically examined, probably imaged, and will probably need lab tests. Without in depth knowledge al, that can be provided is a guess, and that may be counter-productive. See a Physician now.