I have a burning pain in the area around my belly button?

I am a 42 year old woman. I have severe burning pain in the area of my Belly button. I am aware of it for about 80% of the day. It can't be anything I eat, because I wake up with the pain, and it's there for almost the whole day. The pain doesn't move to any other part of my stomach. I don't have any swelling. It is not a cramping pain, just burning! I have tried Buscopan, Scopex and are currently using Librax, without any difference in the pain. I took the test (don't know what its called) where you drink white stuff, and they X-ray you about every half an hour. Nothing seemed wrong. I also had Blood tests done. Nothing showed! I would like to mention that I also use Topzoil, for an Ulcer. But this pain is not from the Ulcer. Thank you for taking time to read my letter. Regards Irene Nel