The 64 dollar question here is that he IS keeping you on, although reduced hours and paying your health benefits. You have a pre-existing condition and can "COBRA" out to about 36 months (and it can be expensive). Technically with only 2 shifts you are part time and not eligible for health insurance coverage in many states. If it were me I would tread very lightly here. There could be other factors that are beyond your control - maybe it awakened his own sense of mortality and it scares him. Scheduling shifts in restaurants is also a tough part of the business. You will have to prove yourself, lip service may not be enough.

It took several years before I felt like a true survivor and people treated me like one. Instead of endlessly asking me "How ARE you?".

I would be careful about alienating customers, or even talking about your cancer experience. Look at the things that you have and put less emphasis on the things you don't have. Restaurants are ALWAYS looking for waitstaff you can get a few shifts somewhere else if need be.

How does anybody know that you have HPV? The CDC states it is a sexually transmitted disease so what would the danger be to customers in a normal working environment?

I have HCV myself and it hasn't stopped any opportunities for me.