Period and illness. help!?

I doubt that you have lost too much blood - the average women loses the equivalent of an egg cup's worth of blood each cycle (and if you think that that is pretty small, actually try it - it's more than you realize). What is sounds like is the you are having a very heavy period and you are anemic - eat some meat and mushrooms or any items with high levels of iron and B12 (not just one- BOTH are required).