I'm sorry you got that unexpected news! In the hopes that hearing of good outcomes makes you feel better, I will share a couple.
I have two friends, both in their late 40's, early 50's, who got the same news. One went with the replacement option that does not require taking coumadin (pig valve instead of artificial, I think?) because he is very active and did not want to be on coumadin. He is doing great and was back to his kayaking, wave boarding, etc. by the summer after he had it done in Jan. The doctors ended up being able to repair my other friend's valve instead of replacing it. He had it done in the spring and just did 75 miles on the MS Ride in New Bern.
Many of these are done, and they achieve very good outcomes. Best of luck!
Grits
2010 Trek 5.2 Madone WSD, SI Diva Gel Flow
2002 Terry Classic, Terry Liberator