How can I go about getting a psychiatrist's notes about me corrected?

If you can't talk to the psychiatrist himself, try the administrator.

confront him or her politley and point out the errors

and tell him or her the correct events and facts and request that they be changed

or if you do not have the confrontation skills then alert through email, telephone or tell his or her assistant or colleague if necessary

there is not specfiic protocoll for this event

good luck