Hi bananagirl
The only one reason I can agree with the doctor to ban all probiotics and herbal supplement is to see if the meds are working as they should be. What I mean, is that for example, if you start taking probiotics sometimes for a day or two (or more) they makes your guts to rumble, can effect in watery D etc. Mostly just for a few days, until your colon gets used to new thing. Te same can go with any intestine supplement. So, when you introduce new medicine, it can be better - from GI's point of view - to stay clear of other remedies for a while. And after medicine gets yours 'ok', then try to re-introduce your herbal and probiotics supplements, step by step, watching out for any symptoms.