i have been sick for about 9months, im a 16 year old girl who was healthy until the day i donated blood...my symptoms consist of :very extreme tired, weak, dizzy, pale, or short of breath,Easy bleeding or bruising, fever, very bad joint and bone pain, bad lower back and neck, dazing out, throwing up, trouble breathing, headache, my eyes and head get very heavy ad pressured where it hurts to open them, and the doctors i went to said my red blood count is low. do you think it could be leukemia ?