hi karen, my husband has cancer of the esphogus. he too has gone through chemo. the best advice we were given is take the medication when they tell you don't wait for the nausea or diaarea to start. this helped mike greatly. make sure he does eat even little meals of cereal is better than nothing. mike would feel good after the chemo but be wore out the next day. the chemo he was on cisplation and irinotecan, did cause diaarea and a very low magnesium level. he would get blook work done on sunday and even if he didn't need chemo on monday, he would need a bag of magnesium. be sure he gets his blood work done and he can get permission from his doctor to get his own results. ask the doctor what the proper range is for his magnesium and other important levels and he will know ahead of time if will need any boosts for his blood or other things. it is scary for both of you but you need to stay strong for your sake. this message board is great to get support for youas sometimes we need it more than the patient does! i will keep you in my prayers! laura