After a normal poop, i started to have an empty feeling in stomach that feels like my stomach has to growl but wont. its a very uncomfortable feeling and idk if its gas or if i need to poop again. ive had this for a while but not this bad?

It is not feasible to provide a meaningful opinion without additional history, physical examination and may be some tests. Visit this site for info: https://www.niddk.nih.gov/health-information/digestive-diseases/gas-digestive-tract/eating-diet-nutrition if that does not help, it would be prudent to see a doctor. Wish you good health!

For some people the work and muscle contractions used in pushing out even a normal bowel movement calls the vagus nerve into play with some nausea being the usual symptom. I think this is the explanation for your symptoms after a BM. I doubt any serious issue but consult a gastroenterologist if you still have concerns.