The answer depends on the circumstances. Generally, while you have the right to an attorney, if you cannot afford one and one is appointed for you, you don't get to pick and choose your appointed attorney. Nonetheless, it concerns me if you have previously filed a Rule 37 against him and then he was appointed again. If he was appointed, you might have an argument, if you made your objections known. However, if you did not object, or if you actually retained him as your attorney, then you may well have waived any objection.
If you are looking for legal advice on your particular circumstances, I suggest you contact a local criminal defense attorney and set up an appointment for a consultation.
No attorney-client relationship is established with this answer. It is not to be considered legal advice, but is merely given to point you in the right direction and give you a general answer as to the law regarding the question you have asked.