Your OH can ask me anything he likes. I may come across as grumpy and argumentative on other threads but i had no-one to ask when I wanted to know "is this normal" or "does everyone feel this effect?" and am very willing to talk about it to other men.
I also know what it is like to be a helpless spectator as my wife is going through a second round of a different and more lethal cancer.
Supporting a scared partner is tough in a different way and i have great sympathy for that side too.
I kept detailed notes of every meeting, exam and treatment from first visit to GP through mastectomy, chemo, infection abscess, radiotherapy and into herceptin, so I know not just what happened and when, but more importantly how it all felt and the effect it had on me and my daily life.
So feel free to ask away.