I think you are getting a bit ahead of yourself on this.

You have basal cell skin cancer, which is typically non-life threatening (not always, of course). I had it on my hand. It was nothing. (I also had a serious cancer...whole different matter.) As others stated, with Mohs they cut off where they think the cancer is, and while you are in the office, they exam the tissue to make sure they got it all. And if not, they go back and cut some more off. My father in law had Mohs many times on his face and ears. He got a bit hacked up but it always healed after a few weeks and that was that. He did this well in to his 80s. Tuff guy for sure. So what? You will be down a few weeks, at worst, I'd imagine. Unless you are a model, you won't be out of work more than a few days, if that.

Re the eye dominance. If you had to change eyes, so what if it feels weird? Get used to it. I was in law enforcement and detached a retina in my dominant eye...so my shooting eye had to change for several years. This was a very challenging problem. That was not some stroll around a garden and take photos problem. I learned to shoot with my non-dominant eye. I had to. So, if you have to change eyes, go change eyes and move on. In other words, "cowboy up."

Re: cancer...do not get spun up on the word. The word cancer is inaccurate. It should be "cancers." There are many types will all kinds of manifestations and treatments. You absolutely have to learn about the ailment from reliable and bonafide sources such as Mayo, UCLA, etc. You want to know (almost) as much as physicians. You need to intelligently discuss lab results, treatments, studies, meds, etc. You should be able to give a one or two minute presentation to anyone on what your ailment is, treatment and potential outcomes. This makes you informed and keeps you grounded. Doctors are my consultants, not my lords. We are partners in my treatment. Keep copies of all labs for when and if you need consults elsewhere. You get cancer, it is game time and no time to get wobbly and sell camera gear. There may be a time for that but you're not there now.

Sorry to be blunt, but, this is my experience.