While I can't answer your questions on tort, it is common for these processes to take quite a while. I was in an accident with another party july of one year, and it was september of the next year before they settled... and she had $3,000 of medical bills. You're going to have to give this time. The attorney's office told you the correct information, the insurance companies want ALL medical bills before they start working on a settlement. You can't charge them for FUTURE medical bills.
No, that's not subrogation. Whether or not they can get the bills reduced is another matter completely.... and good luck with that!
Your attorney is the one that you should be asking how much the case is worth. Nobody here can throw out a legitimate number.
Take care and feel better!
EDIT: And since I hate USPS for always losing my mail, stick it to 'em!