chronic appendicitis does i exist?

i went for a run in august this year quite a tough run and immediately when i stopped i had a sharp pain in my lower right side.  When i got home the pain got worse i couldnt sleep and a doctor came to see me at 3am and gave me some immodium and told me to go to the doctor in the morning.
My gp in the morning said my appendix area was very tender but didnt think it was about to burst and told me it was a stomach infection which should clear up in a few days, which thankfully it did.
Now 2 months on i have started getting dull pains in my lower right side again, where my appendix is, and occasionally sharp pains which are eased when i have bowel movement.  i have been to doctor yesterday and i am having blood and stool tests done, he said basically rumbling appendix does not exsist.  I wish it was my appendix and personally to me it feels like it is, as i am really scared now that i may have something a whole lot scary like, bowel cancer or crohns disease!!
any help or wisdom about my symptoms greatly appreciated