In short, you can leave. You may or may not get severance and you may or may not have other issues.
Generally employment in Tennessee is "at will". This means either the employee may quit at any time or the employer mar terminate the employee at any time. This can be for almost any reason.
Some employment is under a contract. The employee agrees to work for a certain time and the employer agrees to continue the employment for a certain time. In this case, if the employee quits before the time is up, which they can do, they old be sued by the employer for breaching the contract.
As far as severance. Generally an employer is not required to provide severance. If you have an agreement, it will depend on the terms of your severance agreement.
You should probably find an attorney to review your agreement to verify if you will be in breach of any terms and if you will be entitled to severance should you leave in May.
This answer does not constitute legal advice nor form an attorney client relationship. I am not your lawyer. If you have a legal issue in Tennessee you may contact me for a free consult.