It depends on what you mean. I'm assuming you mean some doctor has acted inappropriately toward you. You have a couple of options.
If the doctor works for a hospital or clinic, you can report the doctor to the hospital director or the doctor's supervisor.
If the doctor works for him or herself, you have fewer options, but if what the doctor did is criminal, you can file a complaint with the AMA (if you are in the USA) or the corresponding organization if you are in Another Country, or to the police or other appropriate authority.
First of all it's not against the law to have mental illness. If the person's behavior is not harming anyone but just appears 'crazy' to you, then you do nothing but avoid that person if you are uncomfortable. Only when a person's behavior is a threat to others or themselves, do you need to call someone. You call 911. The responders should be trained to deal with 'crazy' behavior.
Doctors have the capability of becoming zombies as much as anyone else does. But as a general rule, no, doctors are not zombies.
yes
Clavicle
Pharmacies do not call doctors to confirm schedule II prescriptions. If they are unsure about the prescription, they may call the doctor.
bends
There isn't a type of doctor who specifically treats doctors.
Anyone can call the police on you or anyone else.
MCAT
A doctor can be a notary, but has to apply and pass the test like anyone else. Doctors are not automatically notaries.
Anyone could say they were a doctor, even if they had no training. (APEX)
anyone who wanted to be a kind doctor