Im dizzy,light headed,have numbness,sweaty face,weak,and have nausea?

[little_mamaa]

I was walking home when i felt really light headed and weak.I sat down on the grass for a min.Then i got up and continued to walk for a sec. I became really light headed and dizzy.I felt like i was going to pass out.My face started to sweat really bad.Then my head, hands, feet went numb.I was so weak i curled up on the ground.For a moment i even thought i was going to vomit. My uncle just happened to be walking a few feet ahead.I started to yell for him to come get me.He had to carry me home and lay me down. After 10 min or so i felt better but was left with a headache and still a lil numbness in my arms.??? What could this be? Im 21 years old and have never had this happen before. Plez let me know what u think...