Just came across this. Hope things are going well for you, Piper.
I have autism and I ride.
Back when I was in lessons, the hardest thing for me was switching horses. I grew very attached to my horse that I rode regularly and it was difficult to switch. I did learn to do that, though, and I'm glad I got the chance to ride many different horses.
My main issue is I cry (or laugh or have other inappropriate reactions to emotions) when I get frustrated, and along with sensory/social issues, I have fine and large motor issues. I may want to move my hand a certain way, but I can't. Up until a few years ago I could not tie my own boots, I could barely do the buckles on my bridle because of the finger work involved. Everyone asks why my horses go so well without nosebands, it's because I was too klutzy to use them for so long :) At any rate, I would end up crying, not because I was unhappy or not even because I wasn't having fun, it is just the main way my emotions came out, especially when I was a younger adult.
Remember too, that any sensory problem is going to come out ten fold when it's hot, when it's cold, when she's sore, if it's loud in the arena, etc... I take medications to help with these things, but still if too many senses go into hyperdrive at once, I have a bit of a meltdown (which for me is silent, not the angry/screaming a lot of people get).
My current trainer has been the best in regards to my learning and riding, not only do I feel comfortable and confident in him, but he does not ever raise his voice, which leads me to yelling "what??" sometimes, and he follows along being very visual with me, walking me through things one step at a time.
I am glad to see the amount of people here opening up. I also have BPD, autism, depression and anxiety, and there is so much stigma attached that it becomes a tough burden to carry by yourself.
This video is embarassing because it's from 4 years ago and very poor riding, however you can see the way both my trainers deal with my mistakes. Not harsh, just repeating until we get it right. My mare can be hot, but very rarely am I afraid of her, but the stadium part of the video I was afraid. My reaction to fear is to laugh, which is why I'm laughing hysterically in the second part of the video, every time I gave her the inside rein she would bolt. The better thing would have been to quit the lesson and work on ground rails or just on the longe to slow my mare down (which we have to do often) but I think this was a couple days before a horse trial. I was too afraid to release because of her speed and jumping imaginary fences by the open end of the arena. I've been told by every trainer to get an easier horse, but honestly, after 13 years with this one, that change would probably kill me ;) https://www.youtube.com/watch?v=r4tLjnqAEjk