HGT
I want to give you hope. We are very similar you and I, very close in age, we have a young family and we both make our living in sales. Like you I worried that I wouldn't be able to return to how I made my living after cancer.
What I've realized after I actually did become disfigured, my speech severely affected and suffering all of the side effects from radiation...is that it actually made selling easier. Trust me I don't recommend it to boost your career or anything but I'm just saying it's not the end of the world

I was a decent salesman that lead to some success in business. What I find now is that I have to use less sales technique to break down objections because people see the story my face tells. It's a powerful thing really and I find it very easy to get the answers I want...one of the reasons I wear my scars proudly.
Do whatever it takes to beat this shit. Living is the goal, as long as you're alive you can figure out the rest

Good luck my friend,
Eric