Visit 909shot.com, if needed they can refer you to attorneys who are familiar with these sorts of situations.
As for help with the argument, was this condition of employment in the employee handbook (or on some form you signed) when you were hired? If not you can add this to your argument. It shouldn't be the cornerstone of your case though.
It's also worth noting "hospital policy" is not state law. Keep that in mind. I'm confident regardless of the state you live in there is no law on the books making what the hospital is trying to do legal. (That being medicate you against your will.)
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