Before getting through the subject, I want to talk a little bit about myself.
I was raised 15 years by my convict father. My father and I had to go to our homeland so he could escape the authorities here in north America. I finally rejoined with the other half of my family late when I was 19 yo, then I started to get to know my mom and my brother.

Here is a cut through my current situation. I am showing signs of PTSD throughout what happened during my childhood. I also noticed signs of autism, that I suspect I might be on the spectrum first of which are my hypersensitivity to noise. No I have not gone through medical treatment yet.

When mom blames me for acting unconformed from the rest. It really puts a banner on my mouth and I find it hard and invalid to speak up when something is irritating me. For example my brother's smacking of the doors and his heel-walking which I can feel like he is stepping on my head. I am not blaming him for that. I am just expressing how hard it is for me to speak up when all I get is blamed or complains referring that I am acting up so intense.

What are some advice to ease the tension and come up to my brother about my sensitivity, and not being a dick about it?