Mouth sore behind upper left teeth

I have Irrittable bowel, and GERD, however all tests have been ruled out as far as chrone's. These tests were done over a year ago. Also Barrett's esophagus. I get severe bowel bloating and pain at times on lower right side. I have not had much acid reflux however i have noticed some small red bits of stool.   I have to watch everything i eat also. nothing spicey, greasy etc.

Also, weight loss, and lower abdomen pain..on scale from 1-10..about a 5-6. I cannot sleep, also get stiffness, moucus in stools, and has thrown my concentration and living off totally.

Doctors said i have to deal with this. They even thought it is all in my head and which at times i feel like it affects it.
Gave me anti-depressants which did nothing.;o/ Now i am just on a nerve pill. which also does nothing if i get flare ups.

Any suggestions? Please it seems my health just gets worse and worse.