Scared of the Possibilities ...

Hi, i'm new on this forum, joined to see if anyone could possibly give me advice or re-assurance on this strange pain i'm having.

Alright, from the top, heres my story

I'm a male who is 18 years old, lived a fairly healthy life, sports and such, can't say i'm perfect, definately have drank a bit too much at a few parties in the last year or two but its not like i'm an alcoholic or anything.

About 6 weeks ago I had a pain in my side one morning, nothing bad really just a dull pain, it was in the McBurnseys spot (for those who are familiar) it was on my right side just below the midpoint between my hip and ribs. When the pain persisted for a few days I was worried and everyone was saying it was appendicitis, afterall, symptoms matched.

Went to the hospital immediately, had a blood and urine test done, came back all normal, a glimpse of relief that was then immediately plagued by the worry of what COULD be wrong then.

A few days later the pain was still there, i'd been reading a lot on the internet about possible things that would cause this pain, and I read about how sometimes bloodtests don't show appendicitis in rare cases, so I went back to the hospital, worried again. After a 'quick' 8 hours of waiting the doctor saw me, pressed on my stomach and such and said it was no way it was appendicitis because if it was i'd be screaming with pain when he prodded me. He told me to go home and come back if the pain persisted for more than a week. At this point I had been told this a few times by doctors and was getting annoyed, so I asked if there was any scans they could do, like CT scan or ultrasound. I got an ultrasound a few days later.

Ultrasound came back with 'no abdominal abnormailities' written on it, meaning it was all clear. I wasn't happy with that though, because I was still in moderate pain, what I would consider about a 5/10 on the pain scale.

I went to my doctor, he gave me another blood test and urine test, which once again, came back completely normal. So I went home and decided i'd maybe try to wait it out. About 3 weeks later the pain was still there accompanied by large amounts of gas and stomach pain. I went to the walk-in, after looking over my blood tests and asking me the whereabouts of the pain the doctor decided I had Gastritis and prescriped me Prilosec (Omeprazole) I've been taking that for 2 weeks, last pill was today, and the gas is gone for the most part, but now I have new pains. The original pain has moved up to right below my rib bone, also I have a sort of dull pain in what I think is my lungs occasionally. The pain seems to be worse at night, or maybe thats just when I have time to sit back and worry which makes it worse. Sometimes the pain doesnt seem to be there until I start thinking/worrying about it, then it shows up, maybe thats just some psychosomatic responses to me being a worry-wart.

Anyways, I went back to the doctors today and got another bloodtest and urine test, results come back in about 7-10 days, but until then i'm worried about the possibility that the pain I feel is cancer. (Just like me, worrying about the Worst Case Scenario)

Can anyone provide me with some reassurance that it ISNT cancer? I was thinking that if it WAS and it had spread from way down by my side up to BOTH my lungs in a matter of about...oh...6 weeks...I would probably have had other more severe symptoms or something woulda shown up on those initial two blood tests taken about a month and a half ago...

A little reassurance? Anyone? Thanks in advance!