It is not an easy thing to go through. I had to watch my wife go through her second round of cancer treatment and chemo. Then she had to watch me go through my lung cancer treatment. I was fortunate I think in that I did not need chemo treatment. But I do understand it somewhat from both sides. Patience and understanding is what was needed in both cases in order for me to keep my sanity.
I hope all goes well for you, there is life after chemo and after cancer and after surgery.
I think that's the worst part of it. I'm OK that it's me going through the treatment, but I don't think I'd be as OK if I had to watch anyone go through it.
So many people have said "Oh, one of my friends/neighbours/family went through that, and they're fine now, 5/10/20 years on" so it's all good.
In many respects it is much easier to go through it, than to watch a loved one go through it. In America there really is no spousal support, and the doctors and nurses will very rarely talk to the spouse.
That's another downside of the American health system.
There are a lot of problems with health care when the primary controlling factor becomes how much can we milk this person for and add to our coffers. People have gotten far to greedy and the only thing that matters is money.