I feel emptiness in my stomach thu i eat regularly, and it's been like 3 days i get out of sudden a pain in my upper stomach. what might this could be?

Stomach discomfort: Stomach discomfort can result from many causes, but ulcers are one of the more common reasons to get aches and pains in the stomach. Try to relate if it comes and goes with eating or not eating. Antacids can be helpful in identifying if the cause is related to stomach acid. Persistant and sever symptoms should be evaluated by an internist and a GI doctor if needed. Hope this helps!