Are you 100% comfortable with the way the meds affect your mind? As in, can you stop yourself and understand "oh, this is the meds talking" and think about how you would react to situations if you were not on the meds? Same goes for the herb. Are you 100% comfortable with every aspect of the come up, the high, the plateau, the come down, etc? Have you combined the two in the past? How often and how much dosage are the meds?

I haven't heard any specific case of weed+meds combination that causes medical/psychological issues, but it's entirely possible. Personally, in a potentially dangerous experimentation like this I would try to half the meds dosage and have a sitter to make sure you're safe if you throw up or worse. Keep the toking to a low low level (one baby hit every five minutes?) until you're comfortable with the way the two substances combine. Remember, the herb is not dangerous on its own, but it causes side effects (paranoia, cottonmouth, confusedness) that may freak you out on the antidepressants. Be in a comfortable, safe setting, and try meditating beforehand.

Some people have actually quit taking antidepressants because the herb is a much much better medicine than the pills. I suggest you talk to your doctor. They can't go to the police unless they think you're going to hurt yourself or others, because of the doc-patient confidentiality. Just ask him if you might want to try MJ in the future.