Does Severe Hair Fall, Sleeplessness And Low BP Suggest Leukemia?

Hi I was just wondering if I happened to have leukaemia??? I often found that my hair is falling off a lot, it doesn't matter whether if I happened to have long hair or short hair. Also I can't sleep well especially at night does this mean I have insomnia problem??? I have been visiting my local GP when I am ill, they keep on saying that I have low blood pressure - what does this mean & how could I improve my health??? What other symptoms may I have as well that know other GP or doctors have not yet mentioned to me.