So 2 months after going to my GP and asking for a referral, I had my assessment yesterday! (If anyone is in the Rotherham and Doncaster area and is considering asking for a referral, do it now! Their adult autism service only opened in September, so there is currently pretty much no waiting list).
I'll get the official report in a couple of weeks after the panel meets, but the doctor said at the end that she didn't need to call me back for the second assessment since it was pretty clear already and that I should "prepare myself" for the diagnosis.
I'm currently alternating between exhaustion and relief. Although it wasn't anywhere near as bad as I thought it would be, the effort of building up to and then getting through the meeting was exhausting. On the other hand, I am so glad that something I have suspected for so long, but have been putting off and trying to ignore, has finally been acknowledged.