I'm honestly not sure what a diagnostic sheet is but it sounds like it might be something I had to do.

When I was told to see a psychiatrist by my T, he had me answer a whole bunch of questions as a diagnostic tool... most of the questions were really boring like what is the date today? What time is it? What year is it?... things like that to make sure I wasn't delusional I think. Basically it was just questions to distinguish between more serious mental issues and figure out what techniques of treatment might be best for me, and what if any brain chemical imbalances I had.

That's what I'm guessing it is that he is talking about, but honestly Im not sure.

Either way I wouldn't worry too much about this.

Good luck, and I hope things are getting a bit better for you.