problems with gaulblader and ulcer

hi i had my surgery 3 months ago and everything went well about 3 weeks ago i started having some stomach problems had a gallbladder ultra sound came back normal a hidea scan came back normal and i will be having a upper gi and endoscopy this week my sugeon thinks it might be an ulcer i would like to hear from anyone that has had any problems also does decaffe coffe bother anyone . i have been feeling so good and i don't have any regrets i have lost 59 1/2 lbs as of today i can't belive how fast i have lost it