I did weeks 1-5 without tooooo much difficulty - some heavy legs and gremlins to be sure, but no massive physical discomfort. This week though, suddenly I seem to be getting a stitch? It happened during W6R2, but I breathed through it and drank some water and it went away after a few minutes. Today though, it struck about 6 minutes in and just would not shift. i couldn't actually finish the run and had to stop a couple of times on the way. I didn't get a stitch at all in W5R3, so what's suddenly happening? I've been careful with my food and drink, had my normal breakfast (two slices of toast and a cup of tea) two hours before running and even made sure to drink extra water this morning as I worried this might happen. I actually cried a little bit on the treadmill and now I'm just dreading W7. Help!