Girls: is this normal, or should i worry about it??? Plz answer?

Ok i know i already asked this, but i really would like some more answers. So recently (like the last 2-3 months), ive been having really heavy periods. Overnight i could SOAK an overnight extra heavy maxi pad. I know that losing a lot of blood can cause anemia and since my period started i have been feeling really tired, lightheaded. and dizzy. Could i have anemia? should i see a doctor about this? if so, how soon? i dont really want to go if this isnt very serious, and i started my period about a year ago so it could still be a bit irregular. Also I havent had really any stress or exercise/dieting that could be related to this. Anyway, do u think this is serious enough to see a doctor?