L.L.
My eldest is very sensitive...and as she's gotten older, she's learned to balance it with reality. She is an incredibly (and I mean above and beyond) considerate and sympathetic person.
I wouldn't stick your child with a shrink for the world...I think that'd open up cans of worms that he doesn't need opened.
There's too much of this thinking that every child who doesn't fit a certain mold has to have something WRONG with them. He's sensitive...that's his PERSONALITY, not a disorder. Also, given how in tune he is to others, I really don't think he sounds autistic at all.
Just continue to be a wonderful mother and teach him real life lessons, expose him to real life situations, etc...and he'll be a very wonderful child.
:)
As to your further question...no, my sensitive child NEVER acted out. She still doesn't. As a baby, she never cried...and I mean NEVER. She cries more now than she ever did as a baby or toddler. She was a very stoic baby, and a very wonderful and interesting toddler...and she's a very compassionate young child.