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I just want to make sure I understand your question.
Are you saying that you want to use the lawyer that the physical therapist referred you to, to turn around and sue that same therapist?
I see a potential conflict, in that you have to be sure you trust the lawyer considering who the referral came from originally. This might make you question his loyalty to you versus the owner of the physical therapy clinic. Legally, the lawyer can represent you, however, I wouldn't recommend it because if anything goes wrong, you will always have questions.