Thanks Endeavor8. I actually started the VSL3 straight after finishing the course of two antibiotics because I thought they would have killed the bad bacteria (as well as the good).
Conicidentally, I actually have a previously arranged GP visit tomorrow (assuming I can leave the bathroom long enough to go there) so I will see what he says, although he isn't a GI and not really that up on CD. At least he might be able to advise on whether he thinks this is connceted to my CD or is something else.