After my therapist diagnosed me with ADD he advised me to request Rx for Adderall from my GP. My GP told me I could not possibly have ADD because I hadn’t been previously diagnosed as a child.
It resulted in an argument which ended with him, “firing” me as a patient.
It took over a year for me to ask my new GP for a prescription.
It took 2-3 months to find right dose but it was very helpful to me and it saved my marriage.
Some GPs are uneducated and others simply lazy. Mine was both. I doubt such “doctors” are aware of the damage their snootery causes. But, at least I got “fired” and found a real Dr.