The Promissory Note will govern the relationship between the lender and borrower. Most promissory notes will outline the terms of the payments. Generally, the final payment of a promissory note signifies the last date on which the promissory note can be satisfied without a breach. In Florida, the lender would generally have five (5) years in which to bring an action under breach of promissory note, but that may not preclude the lender from bringing an action for damages under another legal theory. I recommend you bring your Promissory Note to an attorney and have them review it with you.
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There is always a statute of limitations issue in any civil matter. Given that this is now some six years old, that is the first and biggest concern about your ability to collect.
As to damages, interest, and the state for the suit, that depends on the note terms. You must speak with an attorney ASAP as this needs immediate review given the statute and other issues.
This answer is for informational purposes only and is not legal advice regarding your question and does not establish an attorney-client relationship.