If i've previously had an ulcer, and i am displaying all the symptoms, could it be coming back? would it be a horrible idea to put myself back on the treatment i was previously on?

Possible: Yes, it can occur again. The most common cause of ulcer is h. Pylori bacteria, which requires antibiotic therapy and acid suppression. Antiinflammatory meds can also cause it. Gastric ulcers (stomach) can be concerning if not proven to be completely healed on follow-up endoscopy. You can take the acid blocking meds but you should definitely see your doctor.