stomach cancer??

I've had symptoms of ulcers for years now. I used to drink heavily up until 8months ago. I had heartburn, and gas alot. I went to the doctor last year and he did a stool test. It came back negative for h.pylori. But prescribed Ranitidine and I took it for two weeks, without drinkn. I felt fine but eventually the symptoms came back again. Ranitidine stop working for me and I started taking Prilosec. Prilosec really did a good job relieving the symptoms but I was still drinkn heavily. I occasionally had black stools, and that's y I got tested the first time. I stopped drinkn cold turkey 8months ago and lost alot of weight. About 20lbs. (But I put on about 30lbs. Jus from drinkn so much over the years.) I still get heartburn and it keeps me up at night. The Prilosec is taking away the symptoms but im scared it could be stomach cancer because I've had these symptoms for so long =( I felt good, and brand new up until I started smoking. So im back at square 1 and I scared to death. No more black stools. Im gassy, heartburn, not really dizzy, but kind of queezy in my stomach but it only became like that when I started reading up on h.pylori n the dangers it possesses. Im 26 and I wanna live a healthy life. Can someone give me insight on cures or calm my nerves a bit??