It's a terrible thing to be told but these days cancer is not the death sentence it used to be. So many more people recover fully because treatment has come on in leaps and bounds in recent years. People presume they will lose all their hair with chemo, but that's not a given. My friend didn't, she kept a full head of hair.
Once you get more info it will be easier to cope with, the not knowing what's going on is worse.
When it comes to the tv, I've just finished Darby and Joan, gentle and easy to watch. I like comedies like Ghosts (the English original), Detectorists, Red Dwarf, Fawlty Towers, The Mighty Boosh, Dad's Army and Not going out and comedy panel shows such as Would I lie to you and Have I got news for you. Quizzes if you are in to them. The light hearted ones like Richard Osman's house of games. If you like detective shows start at the beginning of Morse and work your way through Lewis and Endeavour, then there's Midsomer Murders and for more light hearted nonsense Shakespeare and Hathaway. Also anything with Tom Selleck in works for me, so Magnum and Jesse Stone are great.
There are some great 30 min comedies on Radio 4, Cabin Pressure with Benedict Cumberbatch before he was Sherlock, Quanderhorn, Hancock's half hour, Ed Reardon's week, The casebook of Max and Ivan, The cold Swedish Winter, the list is endless. There are also some good radio serials such as The Lovecraft Investigations - the Whisperer in Darkness about strange goings on in Rendlesham Forest and the serialisation of John Lanchester's The Wall.
This should keep you going for a few hours. Personally, I would go for the comedies, a good belly laugh can boost your endorphin levels. When I was at my lowest in a care home I would watch old school comedies and when I eventually found myself laughing I knew things were getting better.