I feel faint and dizzy every time I stand up?

I think you should get your iron levels checked, you could be anaemic. Do you look pale too? This is a classic sign. The other thing could be low blood pressure. If this is the case you must make sure you are well hydrated all the time. Low blood pressure causes the light headed and woozy feeling when you stand up. It might also be worth asking your doctor about postural hypotension. This is when your blood pressure doesn't adjust properly when you go from sitting/lying down to standing. Either way, see your GP, eat a well balanced diet, take a multi vitamin with iron and drink 8 glasses of water a day and I bet you'll feel better very soon.