lately i have been having prolblems. Hear is some info. I am 14. When i stand up i get dizzy and my vision is almost blocked out by purpal spots. I eat a ok at lunch but when i get home at dinner id don't eat as well. I weigh 148 and am about 5'' 5' - 5'' 6'. My parents have low blood preshur and my dad had a hart attack at the age of 38. Conjustive heat failor is herity in my dad's side of the family. What is some thing i can do to fix the dizzyness and eye problems when standing. (I have 19/20 vision when im sitting.)