Talk to Gastroenterologist on Abdominal

I have a searing pain and burning sensation in my abdominal region. What should I take right now? This pain occurs once a month and it's been for 5 consecutive month. Doesn't happen every time I eat spicy food, happens only once and it's so intense that I feel nauseated and I even vomited last month. What could be the possible reason. ? And whom shall I consult? Thanks in advance