Is there something wrong with me?

i am 14,seem to have a lot of headaches,sometimes feel dizzy and am ALWAYS tired.i have got a lot on my mind with school (GCSE's) and have problems in the family. i have 2 sisters, one older, which is constantly lieing to get me in trouble and pushes me around, and a younger one, which keeps telling me she hates me and life would be tter if i was dead etc.. my parents dont seem to listen to me when i talked to them, and quite often ignore me, with my 2 sisters..my 2 sisters constantly fight for attention, and it drives me mad..in the last 2 weeks, i have started having the same problem with my nan. i am getting closer to my aunt, and now ring her most nights, my parents dont approve, and dont actually like the family.lately my eating has been limited, and i only eat half of what i usually would do.my parents both know that i am unhappy with everything thats happening but it doesn't seem to bother them.even with all this going on, i don't want to say something in case i upset cont......