Do you have to take someone with you/give their contact details?

Hi,

I'm very conflicted. I have my assessment appointment on Thursday. My mum told me a year ago that 'since childhood, you've always isolated yourself at home and have had mood swings'. She now has no recollection of this, and has told me I was completely normal growing up. My dad corroborates the idea that there was nothing out of the ordinary.

I really want an autism diagnosis. It would explain so much (social) trauma I've been through and four psychiatrists have told me they believe I have it. Should I just not pass on my parents's contact details to the assessors?