Honestly I'm only 21 but I already reached the point where I don't give a crap about what people think about my problems. They think what they want it's not going to make it better (or worse).

Honestly the OCD made me reach a point I never imagined I would reach. And this being hypersensitive is just part of it really.

Honestly I'm still not 100% sure about SPD. There is some stuff I can defenitly relate to and some stuff I can't relate too like when you say you become non-responsive I don't have that, I'm somehow clumsy but I don't have problems with my motor skills. But I have stuff like being really car sick (like I had today)

I looked at the SPD adult list:

General modulation -> 7/9
Over-responsiveness -> 20/26 (didn't answer 2 of the 28 questions)
Under-responsiveness -> 1/9
Sensory Seeking -> 0
Sensory Discrimination ->
Sensory Based Motor-Abilities -> 3/19
Social and Emotional -> 18/21
Internal Regulation -> 5/6

To answer your question. I can't just stay 1 minute without having to occupy my mind with something stimulating. It's just impossible for me. And if there is nothing (external) to stimulate me, I start thinking and thinking and thinking about stuff that doesn't even make sense and make up problems. Waiting for a bus is really difficult for me, most of the time I end up walking to the next stations and then I miss the bus lol. Walking if I have music with me helps me.
Put me alone in a room with nothing is impossible for me. I tried and I tried and I tried but I just can't. I really don't know what is causing me to have this but you can imagine that studying is almost impossible sometimes.