Cramp's and the big "D" too !

Hi all, I have been doing really well since coming home except for yesterday I awoke to really bad gas cramp's and diarhea ! I was on the all day and last night through the night and am still having it this morning ! I had not tried anything different yesterday morning other than I had my first cup of caffinated coffee and I also had some cherrio's soaked really well in skim milk. ( this is the first time trying regular skim milk , but was only soaked in it )These are the only different thing's that I had ! All the other thing's were things that I had been eating for a couple day's already ! When I first got up yesterday I had my regular bowel movment and all was fine then shortly after breakfast I started with all this . I did try some Designer Whey Protein poweder mixed with 2 % Carb Countdown Choc. milk which was the day before yesterday and it seemed to be fine for that whole day anyway's . I called my surgeon's office and asked what I should do as I don't want to get dehydrated , and the nurse said to take less of the Benifiber as I was taking 1 tbls. of that three times a day . So now I am only taking 1 tbls. 1x a day and actually I did not take it this mornong b/c I am still going to the enough ! She said I should be fine as I am getting all my fluid's in everyday (64 oz's.) My question here is (now that I have explained every detail to you , ) What do you think it could be causing this and what would you do to help this ? I just want to make it go away ! Ugh ! Thank's everyone for all your support ! and , Carolee