Help with mid-abdomen pain that has been constant for 2-3 weeks.

Healthy, fit, thin 26 year old male here. I have had pain [2-3/10] for a few weeks now. Two weeks ago had a with/without contrast CT scan for appendicitis- negative. Pain went away briefly then continued.

Pain feels like a cramping in and around my umbillical region. Sometimes radiates to my right side/to the right of my belly button. Bowel movements have been fairly regular and semi-formed. I would say I have seen a slight increase in gas [burping] after meals. I can't say that the pain is markedly increased after eating although I can feel a slight increase in pain when bending over in an area that feels centered above my belly button. Been sleeping well [pain does not wake me up].

What do you guys think? Peptic Ulcer? Hernia? Something else? I can say that the pain began a week or so after I had a episode of vomiting [thought it was food poisoning at first although I think it may have been something viral].

Any help would be appreciated! Thanks in advance!