Hi LeAnn. I haven't seen you post before, so welcome to the forum. Sorry you are dealing with these problems.
Even though in theory the chances of facial paralysis or other nerve deficits (such as the trigeminal nerve which would cause the numbness) after radiosurgery are about 3%, there are a few reports on the forum, at least since I have been following it. Sometimes the damage to the nerve is directly because of the radiation, and sometimes it is due to swelling, which may disrupt blood flow to the nerve. In your case, given the timeframe, it is quite likely that swelling is the cause of your symptoms, therefore steroids should be able to relieve them. Usually these problems are transient and tend to resolve after a few months, so I guess all you can do for now is to be patient and take good care of yourself.
Marianna