I'm thinking of you and hoping that this all passes as soon as possible.
I agree that the nurse was insensitive. I've had 4 miscarriages, and one frustrating thing about each of them (in addition to the emotional devastation) was the fact that I couldn't move forward until I had recovered from each. Unfortunately, recovery isn't just waiting for your cycle to return, it's also waiting for the beta to go down to non-pregnant levels. I always felt so stuck when I was in that recovery period, and I hated the fact that I couldn't try again until my system had righted itself again.
Again, I'm very, very sorry, and I'm hoping you'll keep checking in, asking for support, and venting as needed. We are here for you.