Hi Steve……I had a SCT almost exactly two years ago at the Christie, Manchester when I was 64, in other respects, reasonably healthy and, so far (touch wood), I’m still in remission.
Everyone advised me I could feel pretty unwell and I was braced for something much worse than actually  happened. I was out after 14 days. I had some nausea during the reintroduction of my stem cells, I certainly lost my appetite but otherwise I was OK. When I got home, I was fine, apart from tiredness, which gradually wore off. My quality of life has just got better and better (again, touch wood!!).
I know I may have been lucky but perhaps it shows it’s not inevitably a bad experience.
Good Luck 🙂