Hi, and welcome.
Yes, do take a deep breath and chill a little. Talk to a couple of docs and collect info for a while, then decide what you think you should do.
ALL therapies come with side effects, and you may end up getting all of the therapies and the accompanying side effects. Or not. While surgical side effects are immediate, some are sort term while others can be overcome with time and effort. Radiation is the gift that just keeps on giving year after year, and getting back off of luprolide chemo...'androgen deprivation therapy' is a lot slower than getting on it.
The psychological/emotional side effects of the DX have already shown themselves and will continue regardless, however, you have made a good start by dropping by here.
Be optimistic, as you have at least found out that you have an issue that needs to be addressed, and armed with that information you have a shot at protecting yourself.