)Hugs( My daughter had similar symptoms as your son when she was 4. She's now 6. The tactile hyposensitivity was helped greatly with OT, but not the roughness and no sense of personal space. My daughter would bang her head on the floor when she was overwhelmed. We were at our wits end about what to do to help her when we discovered the Feingold Diet. I can't remember the exact time frame, but I believe it was less than two weeks when the head banging stopped completely. We later found out by keeping a diet diary that she did it when she ingested BHT. The only symptom my daughter did not experience was hating blankets, etc. She was the opposite--would bundle up and have 2-3 blankets, and no matter what we did, she demanded them. I recently discovered an article about the part of the brain that receives signals about toileting, temperature awareness, etc., and it finally clicked why she struggles with these issues. (http://www.auxmaillesgodefroy.com/the_insula)
Regarding his aggressiveness and invading others' personal space, we found the Brain Gym and Social Thinking programs helped. They offered it at my daughter's OT provider as a one week "camp" last summer, and she's so much better about controlling it now. If you can't find a Brain Gym or Social Thinking program in your area, you can purchase the info about social skills at www.socialthinking.com.
I hope this helps. I'm right there with you. You're doing great!