Talk to Gastroenterologist on Stomach Pain

I have severe stomach pain and I've consulted a doctor. They say it's just pain, but the pain persists. I've taken a lot of medicine, but it doesn't make a difference. The pain comes and goes, sometimes I'm fine for a few days, and then it comes back. I've undergone tests, including an ultrasound, but everything seems normal. Despite that, the pain hasn't gone away. Initially, the pain was mild and would subside with injections and medicine, but now even those don't seem to work. This has been going on for months. Can you provide some guidance in this matter?"