OK. I'm not a doctor. not a doctor. NOT a doctor. You should see a doctor.
My advice? Stay on the prozac. Stay on the atarax. Start tapering the seroquel. If you are taking it at night, for sleep, go down to a 1/2 tab for 7 days, then go off. Wait a week after that and see if things improve.
Your atarax dose is miniscule, true, but it's the one that is least likely to be causing the incontinence.
Also: do kegels. (I'm serious).
That's my pennysworth of opinion. I strongly encourage you to not discontinue the prozac. It has no track record for incontinence that I can see, but it is the only thing working on your depression.
ETA: is your incontinence stress (like you sneeze and pee) or overflow (like you never empty your bladder) or urge (like you keep getting the urge to go and then involuntarily urinate)?