american airline rip-off

I'm stuck in Managua Nicaragua with a fever of 102 I missed my flight cause of a terrible gastric illness in the middle of Lake Nicaragua. where phone or communications are unavailable. I show up at the main office counter with my Doctors certificate and the annul my return ticket and make me pay $450 for a return ticket, now I'm still not feeling well and they say I have to pat an additional $150.00 ! WTF. American Airlines! Get your shit together and stop exploiting us!