I would call another doctors office and explain the situation. That whole thing seems like too much headache to even deal with. I am pretty sure you can get an office to fit you in for an ultrasound today or tomorrow, and they can call the lab and have them fax the results of the prior test to them. (That takes all of fifteen minutes) The doctor has had the results for such a long time you can probably go to the lab and sign the results out yourself.
I am sorry you are going through this.
Sweetie don't stress so much over not being pregnant. I'm sure it is just their horrible office not having their stuff together causing you all these problems. Glad you are at least getting in on Friday. That'll be a step in the right direction.