That is very interesting, thank you!

So yeah although there is definitely some symptom overlap going on, I don't think I have SPD. I think ADHD can just look a lot like it, and I'm pretty sure I've just had ADHD (plus anxiety/depression that came along in adulthood).

Here's a very interesting description of what SPD feels like that helped me figure out that although I am definitely more sensitive than average to sound (and somewhat to sight) and can easily be overwhelmed by either one, my senses are largely normal:
The Neurotypicals' Guide to Adults with Sensory Processing Disorder