my employer told me i would have the next position available. Ive been passed up three more times. is this a possible law suit.

Generally speaking, oral promises of future employment without a specific "duration" term (i.e., that your employment in that position will be guaranteed for a period of x years) are not enforceable. This is so because employment is deemed to be "at will." A result of the "at will" doctrine is that your employer can change the terms of its offer at any time for any reason or no reason at all. It sounds to me as if, in any event, the "next position" available at your employer is not one you are able to perform. This, too, would be a defense for the employer. When in doubt, consult an employment-law attorney. I am not admitted to the SC bar, and this response should be considered general information.