Patrick, as also a survivor of cancer(so far) and I had chemo, so I know little bit of how you must have felt! Chemo really takes it out of you, but there is light at the end of the tunnel, but the tunnel is quite long maybe as much as two years I'm told, one year in for me! The story of the stairs is also familiar to me!
Hold on things will improve, albeit sometimes it appears very slow, but it will happen. Good luck with your recovery from another member of this terrible cancer club.
Regards
Mike