Cancer Survivors Network

My mom recieved her 3rd chemotherapy infusion on Wed Sept 5th. She showed very little sides. On Thursday and Friday after the infusion her and my dad went out to eat. On Tuesday the 11th after eating she suffered horrible stomach pains that stopped her in her tracks. My dad said she was in so much pain she could not move and after about an hour had a bowel movement. My dad said it was literally as hard as a brick. After that she began suffering from bad diahrea. After that episode When she would eat she would get nauseaus and throw the food back up. She has managed to hold pudding down and chicken soup. She is extremely weak and when I saw her appeared to be suffering from dehydration. My dad called her onc and he has her comming to the hospital to find out what's going on. Does this sound like chemo related sides or something else?