Abdominal Pain

Since July I’ve had abdominal pain in my upper left abdomen then gradually over to the right. The area above my belly button is tender to touch almost like a bruising sensation and firm. All of my blood levels and bloodwork have been normal, EKG/stress tests normal, my colonoscopy was normal, my abdominal ultrasound was normal and showed no abnormal masses, my doctor recommended a HIDA scan even though the ultrasound showed no visible gallstones in my gallbladder or inflammation of any of my organs. I’ve had a couple enlarged lymph nodes in my neck in the last couple months and a CT scan showed that they were just reactive. Though I took antibiotics and they haven’t shrunken. My thyroid is fine. I also have a history of GERD. Any idea what could be causing this? Especially the opinion of any medical professionals on here? 

Thanks!

I meant to add that I’ve also had a barium and an MRI which were normal as well.

Was your HIDA scan normal?  Swollen lymph glands can be a response to infection.  Maybe you need a stronger antibiotic.  Have you had stool tests to look for infections such as h pylori?  Have your bowel habits changed?  Try a food diary.  Have you eaten anything you would not normally eat?