Ok...We had the same ugly 3. Kev had them all together as well as fluids and tons of anti nausea stuff. He did feel really bad for the first week, but, as David suggested, I was the nurse from hell and made him drink and eat. He also went for fluids almost every day and that made a huge difference. See if they will prescribe fluids for him 3x a week at least. We would do a bp with an at home machine. If it was lower than 110/60, we went in. It almost always was. He would get mad at me for making him go, but afterward he felt so much better.
There is a mouthwash combo referred to as the magic mouthwash. He can rinse with this and chug an Ensure or boost or something. There is also a drug called Lortab that worked immediately and Kev would eat something right after. Usually scrambled eggs or pasta with butter.
I know how hard this is. Kev was not well the first round, but by the time we did the second round he was prepared and did much better. We started a probiotic with it so that seemed to help his bowels. Be sure your oncologist approves though.
I would call your doc in the am and just have him checked. I'm sure fluids will help. More than 3 days and Kev was miserable!
Good luck tomorrow. Keep in touch.
Kathy