Reversal in July..now chronic diarrhea

I just saw another post about this.   Does anyone know what to do about it?  It seems to be worse if my husband lies down...had to run to the bathroom and still had several accidents through the night.  He is afraid to eat.  He had been going 8-10 times a day but was kind of getting used to that....pretty normal movements.

Saturday we went to a cookout.  He had one burger, some baked beans, and two beers.  He has been in pain and has had the diarrhea ever since.  Last night he tried to eat six Ritz crackers with peanut butter and was up all night.  Neither one of us is getting any sleep and i work ten hours a day.  He is so embarrassed when he has an accident and I am afraid he is getting dehydrated.  He is very weak.

My husband is 61, recovering from rectal cancer.  He had ileostomy but it was reversed in July.

Any advice will be sincerely appreciated.

He needs to watch his diet much more strictly this early out of surgery. Baked beans, ritz crackers, beer,.. I would think would all cause much increased output. He should probably stick to a GI soft diet focusing on foods that help bulk things up - peanut butter, oatmeal, rice, etc.. Avoid gassy things (like baked beans and beer), avoid chemically foods (ritz crackers).

He also needs to pay very close attention to hydration. Drink an electroyte bevverage that isn't filled with sugar - like pedialyte or ceralyte - on regular basis throughout each day. If he is feeling so terribly weak he may be very dehydrated and you may need to take him to the ER for IV fluids.
good luck.