Everyone is different, so don't let other horror stories unduly influence you. However, as is true with so many things -- hope for the best and plan for the worst.
I am 51, was diagnosed at the end of March with SSC of the tongue base. I had a bilateral neck dissection on April 14, with 2 positive nodes on the right, none on the left. Fortunately, no extracapsular spread.
I started a regimen of 39 IMRT treatments, daily Amifostine IV and weekly Cisplatin on May 14, finished on July 11. I drove myself to every treatment, and did not miss a day of work. Some days I felt pretty crummy, and I went to bed at 7:00 PM a fair amount. I was lucky in that I did not have signifcant pain, and ate solid food throughout, although after week 3, it was mostly soup, mashed potatoes, etc. Still lost 28 pounds, but I could stand to lose another 10, if the truth be told.
By all means have a plan ready for substitute teachers, but approach the treatment with a positive attitude and do everything the doctors tell you --- to the letter!! I think this is one of the big reasons I had a relatively uneventful treatment course. It is still awful, but it is very doable. I am clincially cancer free right now (knocking on wood), and just have the neck tightness and some muscle spasms to deal with, due to the nerves coming back from the ND surgery and the fibrosis after the radiation.
Good luck!!