What would be causing my stomach to feel like it was on fire? I'm not eating spicy food or drinking though those will aggravate the pain

Gastritis. A burning sensation that is aggravated by spicy foods is typically gastritis (inflammation of the stomach). Recommend avoiding tobacco, alcohol, nsaids, caffeine, spicy foods, and take 14 days of Prilosec otc. If no improvement, see a gastroenterologist.
GERD. Possibly gastroesophageal reflux disease (acid reflux), which can occur without specific aggravation. Other aggravating factors are: peppermint, black licorice, carbonated/caffeinated beverage, obesity, tight paints at the waste, smoking... You can try orc Prilosec but should also see your doctor.