Take a deep breath.
It's hard not thinking about the shoulda beens, coulda beens. I have been there so many times. And I too, have wondered and sometimes wish I had never walked in, but I did.
I cried for 5 hours last wednesday, it had been a horrid week, and it continued till friday.
But yesterday, yesterday was alright, and today...today isn't too shabby too.
Try to seek support in your friends, go out and do something, even if you just go for a walk or sit in the park. It may seem hard, but I find sitting home and stewing all day long doesn't help. It's a fine line between grieving and going through the emotions, and laying down in a lump and giving up.
Don't give up.
Hugs to where ever you are.