I went to the doctors on Tuesday, I had had this niggle pain in the leg for a couple of weeks, it turns out to be a thrombosed vein.
I am attending the hospital every morning for Heparin clot busting injections and have to take Warfarin for three months.
This was caused by sitting in front of my PC for too long without getting up.
I did have a DVT 6 years ago after a flight to Indonesia, but this is in the other leg, so be aware guys, this can happen to anyone, make sure you get up at least every 30 mins, even if it's for only 30 seconds.