Your lack of taste is due to both the radiation and the chemotherapy, in all likelihood. Taste starts coming back faster than you might think, but everyone is different. I have probably 85% of taste back, though it is different than pre-treatment. Flavors are more muted, and some things, like dark chocolate, are still a little "off". Lack of saliva plays a part as well, and I do battle dry mouth daily.

As with everything else, it is simply a matter of taking care of yourself and following the doctors' instructions on a daily basis.