It seems like you are staying with him and living a reduced life in order to keep him happy.  What about your life?

I believe that loneliness is one of the worst excuses to stay in a bad relationship.  Make friends with yourself.  Go out and make friends.  Find activities that give you pleasure.  Join clubs, church.  Sit with yourself and meditate on your loneliness (this is a Buddhist-flavored website after all).

You may have PTSD from how your body is reacting (anxiety, sleep disorder, heart pounding, etc.).  Go to therapy for yourself.  There are sliding scale therapists especially around schools who have counseling programs.  You are not doing yourself any favors by living with someone who abused you and keeping yourself from the rest of the world.

With your parents, it seems if you want support, you need to take charge of your own life first and take steps toward a healthy life.

Good luck,
Mark