Update #2:
Slightly tangential, but I went to the doctor regarding my sleep patterns, which are to roll my body from side to side, have done since I was very little. I looked high and low for what this could be and eventually stumbled upon Rhythmic Movement Disorder (RMD) which is closely associated with neurodevelopmental disorders such as ADHD and autism, so it says on the information page.
So I went to the doctor and explained my symptoms. She listened, said she'd be right back, and came back a few minutes later saying, "Well, it looks like you have something called Rhythmic Movement Disorder," and she showed me the same information page that said it was closely linked with neurodevelopmental disorders. I said, "That's it! That's the exact thing that I found!" It's also important to note that when diagnosing RMD, there is a test run to check for epilepsy. I don't think I have it (unless seizures are only happening in my sleep and I'm not sure that's how epilepsy works), but it's enough to bring me to a doc to to rule it out.
The doc wrote a referral for a sleep study and asked me what I would do if it came back normal (I want to see if rocking affects my quality of sleep since I rocked even in my sleep when I was little), as the sleep study only really measures breathing and waking during the night. I said that I'd be going onto the next piece, which is the sensory profile I'm still waiting for from the OT.
"Well, the next step, I'd say, is to send you to a psychiatrist," she said.
"You mean a neuropsych?" I asked, "I've already been."
"And what did they say?" the doctor asked.
"They said I have sensory issues, a weird and unexplained childhood, and an obsessive compulsive personality. But I didn't come here to disagree with the findings. I came here because nothing at all was said about my sleep. I am putting together the pieces of this puzzle, and my sleep is one of them."
I don't know what the doctor thought about that, but it's nice to have that be true, that I didn't need to have a doctor "on my side" about the results. But wow, how strange and impactful to have two humans in a room, and both of them say "It's RMD" and only one of those opinions carries any weight because that human went to medical school.
I can't tell if I'm heartened or depressed by this, but it does feel nice to be on my way to getting another piece of the puzzle "officially" sorted out. And I will indeed be telling the sleep specialist that "the doctor told me I have RMD", even though I knew it before I even went in.
So. Another piece is on its way to being sorted, and man it feels good to have a doc agree with me for once.