Ulcers after RNY???

Does anyone know the symptoms of ulcers whether marginal or other?  I had RNY surgery 4+ years ago and have had a burning upper belly pain for a few months now with low grade fevers and fatigue and headaches daily.  I had CT scan done but show nothing stomach related but a lesion on my liver.  I am scheduled for an endoscopy and colonoscopy in about 4 weeks.  Thanks for your help, Nan.

Pre op FYI: My plan required testing for H-pylori which is the source for ulcers. Regular coffee and tea post op can and could give you ulcers eventually; as told to me. I love tea, but cannot do it since I did test positive for H-pylori. I am almost 1 year post-op. Testing for H pylori is a blood test. Do you get annual full blood panel testing done?