Oh my, Roy, what great strides in communication! I am surprised that your wife didn't get it. Perhaps you could exaggerate, i.e., dab at your eyes, sniffle a little, and squeak out, "It's just that I'm so happy !"
Immediately follow up with "happy sobs."*
And good reason, too!
Killdeer
* NOT "happy S.O.B.s" like you find throughout this site.