I'm sorry for your loss . What an idiot of an OB!! I'm glad you aren't going back to him.
As for feeling sad - you have every right to! Eating choccie helps - don't get too carried away though A glass of red wine also helps me too.
Take as much time as you need to grieve. Do you have an understanding GP - my GP has given me medical certs when I've need it (even for a very early loss at 4wks).