What cost can I claim on taxes for 2013?

My Mother is diagnosed with a lung cancer in 2012, she has food stamps as a income $ 200 a month, she lives with me. I do claim her as a dependant on my taxes, have a lot of stuff to pay for while I care for her including prescriptions, gas for endless doctor visits, food (food stamps of 200 $ not enough) clothes, off course she does not pay for housing since she has no income. What costs I can claim on my taxes for 2013 legally. Thanks, Amir V.