I Have Stomach Pain For Over A Week. Im 5'11

I have stomach pain for over a week. Im 5'11 36, 140pds. Iv always eatten anything but pretty healthy chineese food, eggs. I just saw a doctor should I try to do a cleanse or go be seen for a possible ulcer? Also I rarley drink I do smoke and take pain medicine for degenerative disc disease? I do get some relefe from liquid Milanta? But inbetween meals it hurst the worst and definetly after carbs?