My Wife has many of the same disorders. Her primary medication is no longer covered by her current insurance. We had to switch her insurance and now the premium is three times what it was before.
I hope that if it’s an old drug that it’s cheaper and that you may even be able to order it online or something. Make sure you at least get ALL your records from this doc —
Shouldn’t be too hard to at least get another provider to at least write an RX for the drug, esp if you tell them it’s been helpful ....docs/NP’s will usually give you what you want if you can demonstrate there have been no ill effects or allergies to it. Good luck!