There are ways to control the hot flashes.

My oncologist put me on quarterly depo-provera shots after I had really strong hot flashes for a year. That almost completely ended the problem.

I know someone that says eating tofu every day stopped his hot flashes.

There are other hormone solutions, ask your oncologist about a solution.

You probably want to tell your employer, but if it is a small company they may not want you on their insurance since your medical expenses are much higher than average and could drive up the whole companies costs.