Yes, but the dividing criteria is completely arbitrary. The medical term would be chronic. To me psychosis means a form of mental illness, so it looks like the GP doesn't have a clue.
Thats like saying heart palpitations is an illness and therefore when someone takes a large dose of cocaine and gets an irregular heartbeat, they have a heart problem.
Any definition you're thinking of that places any psychotic episode as a definite indicator of mental illness is completely irrelevant as soon as the subject is under the influence of a mind-altering drug.