It was yesterday that this guy started pushing me and then i pushed him 4 feet back, and my heart was pumping fast, and i have some major headache problems once in a while and the next thing i know, he charged me and i fell on my knees. My head was below and between his legs and his left hand was on my back, holding me down so i couldn't get up. I attempt to get up but finally got up after receiving 3 punches on the back. Then security came. Can someone give me some advice? [ ps. after i pushed him back 4 feet, i started having headache and started getting dizzy ]