My mother had schizophrenia. How likely am I to have this?

A couple years ago when I went off to college I would start getting sick to my stomach out of nowhere and didn't feel like myself. I started thinking I was always sick and kept thinking I was finding things wrong with my body...random bumps, pressure in ears and face...just odd things. I became very paranoid and kept looking online for answers only in turn making me more paranoid. Its like mental sickness manifested itself into physical sickness and then started a looping cycle from mental to physical and then back to mental. I was driving my girlfriend nuts because I told her every night that I knew something was wrong with me. She just kept saying I was fine and to stop overreacting. I could actually think about my head hurting and a headache would come. I went to countless doctors to get my sinuses checked and even got a CAT scan. Nothing showed up. I still have a bad pressure in my right jaw where the upper and lower connect. Sometimes under stress it hurts worse. I think I have messed up the cartilage in my jaw from grinding teeth. And I randomly have anxiety attacks all the time out of nowhere thinking about nothing? Also, I sometimes hide from people for weeks, even my parents and refuse to answer phone calls thinking something bad has happened or they are wanting to yell at me. Should I see a doctor?