No help with that specifically, but a diagnosis does help with explaining to people, and did take a lot of the pressure off me.
I suppose it would depend on what an individual person's triggers are, as mine tend to be entirely avoidable with a little cooperation from others. I last blew off at the dental X-ray technician who kept asking me to relax my shoulders down, which felt unreasonable to me, as every single time she asked, I explained that they didn't go down any further and I didn't think I could make them do so (they've been that way all my life).
After I eventually yelled at her, she moved the machine up about a cm and my shoulders fitted under. I related the story to my occupational therapist, who said that, while it would have been preferable if I hadn't shouted, the technician should have listened to me in the first place rather than just ignoring me until I exploded.
Usually I take other people to appointments with me so that they can intervene if there's a communication problem like that, but that's problematic with X-rays...
I suppose what I would stress is that it takes two to tango. I'm not saying that this is necessarily true for you, but Mumsnet, and in NT circles generally, there's a consensus that the autistic person is the problem. They aren't, the problem is usually BOTH of them. From where I'm standing, I feel like NTs often do things like setting up unreasonable expectations, and complaining when I fail to meet them, or ignoring what I say, or actually listening to what I say and then taking offence at something they say is what I "really meant", when I only meant what I said and no more.
Relationships are built on compromise and meeting each others needs. Both partners need to change, and understand that the other has different needs which may differ from those that are expected by the other person.
Autism often comes with dyslexia type problems like poor working memory or executive function. One thing that my boyfriend and I compromised on together was that he got mad I never tidied up after myself. I explained that I was trying to, but I lacked the ability to pick out what needed to be tidied from my visual field, which can be quite overwhelming.
We compromised, by agreeing that he would collect my clutter into a pile, and if I saw such a pile, I knew the things in it needed to be put away properly, by me. It worked very well, because I was still doing the heavy lifting, and the extra "mental labour" I was asking him to do was a lot easier for him than me.
But on mumsnet, especially if the genders were reversed, that would be unacceptable, and I find some of the vitriol posted here at times very difficult to read.