My stepmother's got a fever today, and pain in her chest. These were the initial symptoms of her last several bouts of pneumonia, which would be fatal if that's what's going on. No matter what it is, her immune system is severely compromised, and her doctor has said it's unlikely she'll survive any infection.
And yet, it may be some minor thing that she can throw off--we just don't know. She's had so many better days than we anticipated that it's hard not to feel like the sky is falling now that today is not a good day.