Hang in there. Sometimes we wonder why things happen to us, and we just don't understand what God is doing. I believe that God puts us where we are meant to be for His purpose. What you are going though is tough, but you're just as tough.
God has you there at this time to touch someone, perhaps a nurse, a doctor or an aid. He has you there to brighten someone's day with your sense of humor, or inspire someone with your faith, and courage.
Things happen to us we really don't understand, but trust that God is in control, loves you, and has you in this circumstance for a reason. Keep the faith, fight the good fight, be a light to others in this time, and trust that God will reward you.
"Have I not commanded you? Be strong and courageous. Do not be afraid; do not be discouraged, for the Lord your God will be with you wherever you go." Joshua 1:9