What do I need to do?

Consult with an experienced employment attorney before the termination if possible.  It will cost a little money, but the consultation will help you get prepared and put you in the best position you can be in to move forward with a claim.  However, Tennessee is an employment-at-will state means you can be fired for any reason and there is no liability for the employer unless there is an unlawful motive for the action taken against you. There are generally only two forms of unlawful motives: unlawful discrimination or unlawful retaliation. Discrimination in employment is unlawful if it is due to race, color, sex, national origin, religion, disability or age 40 or older. Retaliation in employment is unlawful if you engaged in one of a handful of "legally protected" activities and were fired for engaging in that activity. If either of these was the motive for the termination, then you may have a claim for unlawful termination.  Additionally, harassment is unlawful in Tennessee only if it is directed to you on the basis of an unlawful factor such as race, color, sex, national origin, religion, disability or age 40 or older.