I am being sued for breach of contract, duty to loyalty without a contract, without a non-disclosure, and without a no compete contract on the grounds of I breach a non-existent contract when I informed my patients I was leaving this company to start my own clinic
First get a lawyer. I assume they are alleging torturous interference.
Securities / Investment Fraud Attorney
This could be messy. Are you sure you didn't sign anything? Did you receive an employment manual that could construed as a contract? Yes, you need to an attorney right away, but be prepared for protracted litigation.
The foregoing is not legal advice nor is it in any manner whatsoever meant to create or impute an attorney/client relationship.