I've had stomach problems my whole life. I'm always having a burning sensation, it never goes away. I recently threw up blood some was bright the rest looked like black but burned and tasted like if I had taken some pills.
Have you been checked for H pylori infection, gastritis?
Have you ever had an upper endoscopy exam.
You should see a GI doctor to get a work up if not done already.
If you already saw a GI doctor and they did not help you, then you need to see a better GI doctor.