whats wrong with me? I think i've eaten to much cheese over time?

[Will]

i eat alot of junk food like hot pockets and cheese tortilla with wolf chili on it and frozen pizza the healthiest thing i eat ass a meal is occasional subway very rare though i am a physically healthy person...my metobolic age is 12 and i'm 20 but on to the problem sometimes i feel light headed when i streach or when i sit for a long period of time and then stand up i don't understand i exercise regularly i think i've eatin too much cheese overtime