In reply to AndrewW:
I tore one of my abdominal muscles last year which is probably not dissimilar. I couldn't do any core exercises for around 3 months, closer to 4 before I could start to do anything more than quite gentle exercises. Very frustrating and I found the easiest thing was to more or less put climbing to one side for a while. I did use the time to do other things (eg. photography) and after a month or so started to do some more cardio but the problem is that a a lot of cardio does work your core muscles. Even long walks over rough terrain were a problem. But you do get over it eventually!
A note of warning, however, take it slowly when you get back climbing. I think I was pushing too hard in cold conditions and ended up with a full thickness tear of a shoulder tendon....
