What Causes Headache, Vision Blurring, Dizziness, Finger Numbness With Back Pain?

I am 16 and relatively active, I have an almost constant headache, and have had this for almost four years now,my vision blurs, I become very dizzy, and it gets worse while exercising. I get sick to my stomach every time i eat, regardless of what it is, this has been happening for about a week now. I feel perfectly fine (other than the usual headache) when I don't eat. Two of the fingers on my right hand has become numb since November, with twinges of pain shooting to my elbow and back. Could this all be related and be something serious? My family acts as if it will pass, but it hasn't yet.