Wow, lovebirdsflying, you have described my own husband practically to a "t," including the whole losing-a-pet scene, during which my husband admitted he shed tears when our dog had to be put to sleep (I wasn't there, I was too devastated) but acted at home like nothing at all was wrong. He's a scientist, so I've always ascribed it to his logical, scientific-like approach to everything. But I think it's done harm in our 16-year marriage. (And it doesn't help that I'm one of those overly emotional types who chokes up at TV advertisements!)
Anyway -- I'm not trying to hijack your thread, I swear! I just wanted to say that I can identify with pretty much everything in your post.
I wish I had some advice. I unfortunately do not, but I'm sending hugs your way, and letting you know that you're not alone in dealing with an ultra-stoic spouse. Good luck!