HELP PLS!!! Should I be upset or not at what he did that is a life changing event?

I think it's time to move on. Every time you two have from now on, you are going to remember how he went ahead with the vasectomy even knowing you were against it. He doesn't respect your views or feelings. If you stay with him, you are going to have to let him boss you around on other matters too. This relationship seems very one-sided to me.