Sorry for your husband issue.
In order to help you find an answer, could you please answer following:
Since how long he is having this issue?
Any history of passage of blood in diarrhea?
Any associated history of vomiting?
Did his stool examination done?
The liquid stool happened for 2 weeks in Feb 2012 while in the hospital. Recently, just happened again today. In the past (almost a year ago) he has had liquid stool with blood, although no blood presently. No vomiting. Don't understand your question of "Did his stool examination done?"
We have not tried Imodium. How quickly will this work? He is going about every 2 hours and it is all liquid (not just loose diarrhea). Has yet to make it to the bathroom :(