I've thought more and more about getting the snip... it seems to be so mainstreamed and no-big-dealed in our culture today. Jason Jones had his recorded and played on The Daily Show - censored on TV but uncensored for the studio audience. It's just one of those things guys seem to do when they're either at a certain age, or know another baby would financially ruin them, or both.
Since the decision is over and irreversible, it might be helpful to view the counterfactual - pretend you were born sterile and somehow produced two kids through very expensive and intrusive miracles of biology and science. And that miracles just won't happen again.
This might not help but - I'm sure you did the right thing.
"Don't think it hasn't been a little slice of Heaven just because it hasn't!" --Bugs Bunny