Patty,
I know that many people's PET's on here have lit up from time to time, and there was nothing wrong- it was from scar tissue, etc.
That said, I understand everything that you are saying, and have been there and back and there again! Right now I am nearing my first 6 month checkup with my Onc (before now it had always been every 3 or 4 months - the waiting 6 months is killing me) and am a bundle of nerves - every ache and pain I am sure is the cancer.
This survival thing isn't easy. Between second guessing each pain and wondering why we are the 'chosen ones', it leaves us little time to celebrate the fact we're alive. I hope that in the 2 1/2 months ahead, you find some time to do that. Whether we worry or not, the outcome is going to be the outcome..worrying never really changed anything that I know of.
Anyway, all you have to do is read some of the Early Stage posts to see what a mess I (and dare I add others? ) can be dealing with this disease, so don't feel bad. You're in good company here.. keep posting.