Im A 24 Year Old Female And For Over A

Im a 24 year old female and for over a month now I have been feeling nauseous constantly, dizzy, I'm now experiencing motion sickness when driving in a car and I've started having nose bleeds. The motion sickness and nosebleeds have developed within the last 2 weeks. I haven't changed my diet or exercise at all, or eaten athere any new restaurants. What could be causing me to feel sick all day every day?