Yeah, sounds like you’re kind of screwed. 30 mg temazepam isn’t a particularly high dose, but lots of docs are unreasonably scared of benzos. Ironically, your case would be much stronger if she were abruptly discontinuing something which could cause life-threatening withdrawal if stopped abruptly.
However, this isn’t medical abandonment. First off, she* isn’t *refusing to treat you, she’s just refusing to treat you in the particular way you would like to be treated, and the treatment plan she is offering is well within the bounds of standard medical practice.
And if she were refusing to treat you, the obligation to refer you elsewhere is pretty light, and certainly doesn’t require her to find a doctor who will give you the particular treatment you want.
The one time I actually had to fire a patient, I consulted my lawyer and was told that saying “there are lots of great doctors in the phone book, and here’s the address of the free clinic” was sufficient. Which is good, because no way in hell was I going to send that person to anyone I actually knew. It might be different in the case of someone practicing a rare subspecialty and/or in an area with very few doctors.