I dont feel any different. Its only been abotu 4 months, but emotionally, physically etc I dont feel any different. Ofcourse, its good to know the fact that all that wrong stuff inside is gone.
And no, not going through any "mourning". Just wondering, from whoever youve spoken to that has maybe expressed that feeling, did they say why theyve felt that? I wouldve thought, that if it was by choice (rather than purely medical reasons) that theyd be pleased to have the hysto done. But again, Im sure it can take some getting used to for some people.
In terms of never being able to have children biologically, if that is part of the reason for the mourning, it does suck. I guess in that sense, I went through a brief bit of the mourning over never being able to have children biologically mine, ages ago. That was because I had to, I knew itd never happen, unfortunately. And this isnt to say I never wanted kids. Ive helped raise some, and Ive worked with them and have worked with a childrens charity since I was 15, children are probably my biggest passion. But Ill love them regardless of them having my DNA or not

Hopefully that rambling will be of some use to you :p