1. Stay positive! While the inclination is to go into a funk and a "Poor me" frame of mind, those things lead to inactivity and "What's the use?" thinking.
2. Listen to the doctors and do EXACTLY what they say. No "bargaining" on the treatment.
3. Stay active! Walk, work, play, do anything you can. You can do more than you will feel like you can do. Some days you just want to stay in bed -- get up and go for a walk, even if it is just around the living room. Work puzzles, read books, continue at your job as long as possible. Get the rest you need, but do not use cancer as an excuse to lie around.
4. Lots and lots of water, and eat, eat, eat. Everyone will nag you about this, but it is vital to keep your energy up.
5. Listen to your body. Sense what the new normal is, and ask questions as things change. Don't be afraid to call your doctor.
Those things got me through. Of course, be sure you go to a CCC if you can. A little knowledge can make a big difference.