I well remember how I felt in 1997- age47- Stage 3c, a lot removed, followed by Carboplatin chemo. Now my sister has been diagnosed with possibly similar so I have started to read again.
My mother had developed Alzheimer's, and I was really distraught, plus my own life was a mess and I was a t a very low ebb, then I got cancer.
Basically, I believe you have to try to make your life as good/happy as possible and read, discuss and decide for yourself what to do during and after your treatment. I argued with the onc (he was lovely!) and was a horrible, demanding patient. After a lot of my own research, I decided to gradually build up Vitamin C (Solgar with flavonoids, 6 grams a day as diarrhea came when I tried more) and have Iscador mistletoe injections - this was all started during my chemo. I also decided on selenium tablets and Vit B - don't remember what exactly.
My lovely onc said go ahead if it makes you feel better! Touch wood, that was 18 years ago and nothing since. I remember the feelings of being very lonely and wondering for years afterwards, with every little pain I my body, if it was coming back.
I now only take 1 and a half grams of Vit C daily ( give my body a break of a few months now and then!) and have stopped the other things although I continued for years.
Good luck to you all, be strong as possible and try to take some decisions for yourself as your body can surprise you. A huge hug and love.