I am So sorry you are having continued gut/diarrhoea issues, @Number2 xx (Interesting name, by the way! ;) Apologies, if I sound flippant!) xx
If you are having really nasty diarrhoea issues, you may become dehydrated and that is not good. It needs to be addressed asap. Keep up your fluids & taking stuff like Gatorade, to keep your electrolytes up too xx
IF you feel really crook tomorrow/Sun, I would suggest that you present to your closest hospital emergency ward, explaining your chemo regime & gut issues. They should run blood/gut/poo tests, to see what is causing it.
My husband had a particularly nasty bug during his chemo that ended up being septicemia - he ended up in a serious condition in hospital, needing a special regime of antibiotics to 'beat it'.
If you don't feel 'too crook' tomorrow, continue with the Gastrostop (usually take it after every loose motion) .... then contact your chemo ward first thing on Monday & let them know of the continuing attacks and ask for specific tests to help identify the culprit.
take care xx