In order to understand and answer your question, it is important to understand what PTO means. Please provide more information.
This is meant as general legal information and is not to be construed as legal advice in an attorney client relationship.
On the facts you posted, you have no grounds for a complaint, let alone a lawsuit. You are working in an 'at will' employment state...you can be fired for any reason or no reason (excepting those protected classes, race, religion, gender etc,). The fact that the company is trying to find you something else is encouraging, but you would be well-advised to immediately begin looking for new employment.
NOT LEGAL ADVICE. FOR EDUCATION AND INFORMATION ONLY. Mr. Rafter is licensed to practice in the Commonwealth of Virginia and the US Federal Courts in Virginia. There is no implied or actual attorney-client relationship arising from this education exchange. You should speak with an attorney licensed in your state, to whom you have provided all the facts before you take steps that may impact your legal rights. Mr. Rafter is under no obligation to answer subsequent emails or phone calls related to this matter.