can i become a Pain Manag. nurse?

Hello all!
i am an RN for 8 years, and also have a B.Sc. Pharm (pharmacist) degree from Israel. I'm planning to move to USA .this degree is not useful in USA (at least for today).
i know that there is a specialty of Pain man. nurse, and it's very close to my pharm degree and to my knowledge about the drugs. am i right?
are there any other specialties, that are close to medicaments as the PMN?
what should i do to become a PMN in USA?- courses?degree?
Thanx a lot!
Anna