I always feel sick and I'm not sure why.?

Every morning I wake up and instantly feel sick. I never vomit though. I know I'm not pregnant and I'm only 17 years old. I have a history of high blood pressure. I don't eat unhealthy and I have a lot of exorcise everyday except Saturday and Sunday. I get plenty of sleep most of the time. I have constant headaches as well...anyone have a reason for any of this?