Hey David...
Your story sounds pretty much like mine in that I knew I had a murmer since birth but it never slowed me down. I played sports, served in the military, never gave a thought that it might be an issue. I also never knew I may need a surgical procedure either. I had a similar incident to yours in that one of my dogs got loose and I went running and hollering through the neighborhood looking for it. All of a sudden I couldn't catch my breath and then I was down on one knee and then a face plant into the grass (fortunately not the sidewalk). I chalked it up to an anxiety attack and didn't see a cardiologist for nearly a year later !
Upon my cardio appt Im told that I have bicuspid valve with severe stenosis and that I need surgery ASAP. He told me that he takes 100 people like me and come back in 2 years and at least half will more than likely be dead. Needless to say that was a wicked kick to the privates.
Like you I was quick to the Internet when I got home. My first clicks were looking at the procedure itself and I was quickly dry mouthed with fear. Fortunately I also found my way to the Cleveland Clinic website and this forum. You will find great comfort here as many have been in your shoes and mindset.
I was fortunate to not only get nearly immediate access to a wonderful surgeon I also had the option of having the procedure done right away. I was 15 days from initial diagnosis to surgery and in looking back I wouldn't want it any other way. I think the anticipation your going through right now is MUCH more stressful than the procedure itself or the recovery. I had never had any type of surgery prior to this other than toncils out when I was 2 yrs old and I had several meltdowns prior to heading to the hospital. My Dad passing on 15 years ago due to complications from OHS didn't help me mentally either.
Best advice I can give you is to find a surgeon your REALLY comfortable with, pick your valve, cut to the chase and get it over with. Im 43, I went mechanical so I can hopefully avoid another OHS. Im 10 months post op and other than the scar on my chest you wouldn't know what I've been through. I feel so much better now, no dark bags under my eyes, no struggling with even lightly moderate exercise, and certainly a mindset that is thankful of what I have been blessed with in life. I think all will agree that there is more appreciation for just about everything in life once you get back to living it.
Im a numbers guy and that is what I fixated on. Its comforting to know that for a BAV replacement the survival rate is in the 99% range. I sometimes wonder if that includes those that may have complications in the hospital due to infections and such. Hospitals like to have those numbers as high as possible so I even look at those with some bit of skeptisism. But even if that number is 95 or 96 percent I would think those cases that didn't end favorably also had other issues going on.
It sounds like other than the valve your in great shape, so try and keep your thoughts positive because your not only going to get through this your going to look back in 6 months (like you said) and your gonna be grinning ear to ear.
Also, your from New England ? Im from NY and its nice to see someone say something positive about my hommies ! But I gotta ask you, "How bout them Giants ?"