Can stomach cancer be diagnosed without actual tumors being visuall? i have hpylori, severe gastritis and ulcers along with interstitial cystitis.

Yes: Stomach cancer is usually diagnosed by looking at biopsy specimens under the microscope. Samples are obtained by scope evaluation (egd). Treat your stomach problems with potent acid-blockers; avoid smoking, alcohol, and other irritants. Barrett's esophagitis or stomach cancer should be monitored by your GI doctor with regular egds.

Biopsies: Stomach cancer is very unusual at 35 Y.O. Stick with the meds your GI doctor gave you, it sounds like you got an egd and are concerned they missed a cancer. That is very low probability. Interstitial cystitis would not be related to stomach cancer. You may, as well, have some issues with stress. Consider getting treatment with a medicine that helps decrease pain signals if so, likecymbalta