I had a string of about five flats in eight weeks or so a couple of summers ago. I had just put new wheels on my bike and my husband had put in slightly too-narrow rim tape, as it turns out (Kathryn, rim tape runs inside of the wheel rim and covers the spoke ends so they don't rub against the tube). So apparently at least one or more of the spokes were rubbing against the tube and causing flats. I had one pinch flat, but the rest of the tears/punctures were on the inside of the tube, which is indicative of a spoke rubbing the tube.

Like you, I got really paranoid for awhile there and couldn't enjoy my rides - I'd be constantly looking back between my legs for a flat. When we finally discovered the problem and put on wider rim tape, I got over that pretty quickly and never got another flat on that bike!

I've only had one other flat since on any of my bikes, on the rear on my Bike Friday, and I was paranoid for awhile after that one too and still find myself checking back there from time to time when I ride that bike if things start feeling a bit "bouncy", but so far, so good (crossing fingers). Overall I am really lucky with regards to flats, possibly because I am a lightweight, which I'm thankful for!

Good luck,
Emily