It sounds like the issue isn't whether you want to have another baby, it appears that you're struggling with the fact that you aren't making the decision, it's been made for you by virtue of the vasectomy.
I always like options. To be sure, we both thought this whole thing through before I had it done. I'm comfortable with the decision, it's just too bad I don't have an ON/OFF switch to suit my mood. I've only pondered this a couple of times before:
Being told that my umm...sample tested "all-clear." It hit me for a bit afterward.
Being told by a specialist that it was highly unlikely to be successfully reversed.
The decision is made and it is still in effect---but it's a decision I made. This too shall pass. Since I work hard to keep in shape and stay young, this is simply one of those things that just aren't possible---so it's a part of the larger picture of getting older. You know, these knees of mine also don't allow me to catch for that adult baseball team (the one that asked me to play). I just have to admit it's time to mourn the past and celebrate the present. Wow, CSA does fit in here doesn't it? ....Still working on that one.
Maybe all this rain has made me pensive...