I found this online -

The F Scale This scale is used to detect attempts at overreporting. Essentially, people who score high on this scale are trying to appear worse than they really are, they may be in severe psychological distress, or they may be just randomly answering questions without paying attention to what the questions say.

This scale asks questions designed to determine if test-takers are contradicting themselves in their responses.

So it seems like maybe your answers seemed contradictory. I have never taken this test but this seems kind of scary. I’m sorry you’re not happy with the result, hopefully your doctor will talk to you about it more.