Let's address the other elephant in the room.

Having a mental illness isn't going to even matter in many cases. The BIG question as of right now, is what's the current schedule? This isn't the first custody-based question OP has asked here...but the details matter.

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Quote Quoting PADriver13
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What if there is a patient information release form in place? I know my wife is able to be given any and all medical information related to me...not so fast.

OP - your first step would be to simply ask the therapist if he/she would be willing to testify on your behalf. I suspect she will decline as it is a conflict of interest to have your wife's therapist testify on your behalf.
Psych records are not the same as other medical records, necessarily. I suspect OP is not going to have a good day today....just a hunch.