One of the reason it is fairly easy to obtain SSDI for cancer patients is that cancer fatigue is a well known side effect. I slept a lot also in the early post Tx. I am back to normal now pretty much (at 10+ mos' post Tx). He is still in the window for experiencing the full effects of his treatment. I had to be rehydrated a few times myself. It's a whole lot of work to drink 2-3 liters of water a day like they recommend. Make your appointment for rehydration in infusion rather than emergency - it's a lot faster and much more pleasant. You'll be in and out in an hour.