Please help me, parents bullying, swine flu?

I have swine flu and a very serious chest infection. my parents booked tickets to go to the theatre. they know i am ill, but my mother is so selfish and nasty, she is dragging me to the theatre, with sore limbs, an aching migraine, a high temperature, and feeling drowsy and falling unconscious on the spot. my dad said he would stay behind with me because he knows i am ill, but my mother, being typical has had a total tantrum and has started shouting at both of us. tomorrow i thought i would feel better so i made plans to go to the movies to see new moon. my parents are now saying i have to go tonight or not see new moon. ( i just fell unconscious by the way for like 3 hours) my big sister is screaming at me because she wanted to go, and pulling looks at me. what should i do?