Martin,
I ran FLM 2001, and haven't run since. I started again about four weeks ago, and could barely get round 2 miles (co-incidentally, I had to stop four times as well). I'm now up to four miles, without stopping, in 36 minutes, which, personally, I don't think is too bad.
I'm no expert, but I would suggest: don't push too hard, too early. It's not how far or how fast you go at this stage, but the getting out there on a regular basis that seems important - build up gradually, and you'll be surprised at yourself. I started off by running 2 miles every two or three days, then moved up to three, and now four. I don't run the same distance every time - currently a mix of three and four-milers. You need to allow your body to recover as it gets used to this new exercise you're putting it through. From what I hear, allowing your body to recover is just as important as anything else. And being slow isn't a crime either - there are a lot of fast people on this website - but there are a lot of us slowies as well.
There are also some good training schedules on here somewhere...
Trust me, keep at it, and it will get easier!
Best of luck, and leep us posted.