It's interesting that a couple of things I read talk about the "seven stages of grief" model applying to finding out that you have a disorder of this kind as well - I can't remember all the stages and they are generalised, but the "bargaining" one in this situation is more about how people tend to fixate, when I get the diagnosis it will be much better, if I can get the right medication it will be fixed. It's about coming to terms with the fact that none of this is going to change anything, it might make it easier to manage, but it's not going to make it go away entirely.
I need to ask a question which is relating to ADHD I think more than ASD but perhaps there is a parallel. Do you find that if you miss a "deadline" then it's like the urgency goes away because you've already lost whatever it was and so just seem to trail on forever?
Two recent (but not the first by a long shot) examples for me: Library books and bedtime.
I have stopped using libraries in the past because of the same issue, but currently because we live in Germany the English language library is obviously a great resource. So I thought we would try it out, and the first two months were fine. Right now I have a fine approaching ~€30 because of five books which were due back on the 29th Jan. I missed the deadline and then because it wasn't "urgent" any more, it was like the increasing fines didn't really matter. They're about to close for the Easter holidays! I am hoping we can get there tomorrow, but still.
And bedtimes - last night I felt tired at about 10, so I was just finishing off some things and was about to make DS' lunch, when DH put the (not) roomba robot hoover thing on and said "Can you stick that on charge when you go to bed please?" I said "Oh no, I'm just about to go to bed too, I just need to finish this and make DS' lunch." He (probably knowing my history!) said "Oh you've got loads of time then". To be fair, it is a cheap one and the cycle is probably about 20-30 minutes before it needs charging, but then I didn't want to get up and get ready for bed and then be waiting for it to finish. It beeps constantly when done, so I couldn't have left it to go to bed. I ended up staying up until 1.30, failed to set my (5.30!) alarm properly and overslept and had to run at full speed to catch my train, where I nearly fainted and/or vomited because I'd then pushed myself too hard on low blood sugar, I hadn't eaten since 6pm!
I mean, it's possible that I would have got distracted anyway, but I'm sure it was that interruption that sort of tipped me out of the mindset of "I need to be aware of the time and go now".