I try to answere to your interesting and difficult issues (because I really would like to ...).
The issue with proving you do not have psychological problems
is the criteria for psychological problems
is so broad that nearly everyone in the population could be said to have psychological or even psychiatric problems.
It would be denying the human soul if you would need to prove anywhere that you are fine (without psychological problems), because being fine is always a task - and within human communication.
Therefore it could/should rather only be recognized as a joke to prove that you havn´t any "problems".
Given the huge complexitiy of the human soul there are of course every then and when some "problems".
However, you are (and ever will be in a basic sense) right to say "it would be so broad". And this seems to me the core "task" to humans, to solve any "problems" (and thereby indeed steadily such abstract problem).
But the question is of course if you need to mention any problems because they would be serious enough to cause a state of "illness" (which would be neccessary here but also of limited power). Maybe easlily you make a mouse to an elephant.
And here my doctor - typically in either way I think - went miss.
1.
Assume that the doctor knew that if I would have tried somehow to prove that I have no problems, the doctor could - in their view of my complaints - immedialty have said: "He needs a psychologlist, because he doesn´t understand/feel the human nature which consists of a perpetuation and not of a block ´being fine (without problems)´". But then, as I refused to prove anything, the docotor said to themself: "Ok, with any psycholgist here is nothing to gain. We need to apply tougher methods."
It may sound like a joke, but this is how it ran.
2.
It might also be possible that the docotor really meant that I should prove such nonsense. And I am from germany, so with a small chance it might be even more considerable.
Anyway, it needs to be pointed out I think that the
mentioning of - inferior, normal,
productive - problems is contraproductive (and can lead eg to what in english is called "selfconsciousness", great word btw). So, that does indeed not mean that these/such "problems" wouldn´t be of importance. It´s rather a matter for culture ... culture needs to be recognized as a task, which may lead again to selfconsciousness ... it´s a task without any end.
... the criteria for psychological problems is so broad that nearly everyone in the population could be said to have psychological or even psychiatric problems. The criteria are not objective and are too inclusive.
....
Its just that its easier to show we have the full range of ME symptoms, with objective tests, than to fight things on problematic psychological grounds.