I don't understand how Viv is dying in one scene, and Tom rushes to her side to be with her, and then suddenly in the next scene Viv is absolutely fine. The movie didn't explain what disease she had or what had happened, other than the fact that we can see she obviously recovered. Was there a scene there that got cut for some reason? What was the point of showing this?
shareShe had influenza, which can be fatal and which in 1918 killed up to 100 million people worldwide (it was a particularly awful strain): https://en.wikipedia.org/wiki/1918_flu_pandemic
In the 1918 pandemic, young and previously healthy people were particularly hit hard, so it wasn't a stretch for Viv to believe she was dying. Of course, her temperament also contributed to her belief that she was, but I don't doubt that she felt truly awful. The flu is not just a bad cold -- it's intense, and it fells people. (I had a bad flu in the late 1990s, and it's the sickest I've ever been -- for a few days, I couldn't even stand up.)
"All you need to start an asylum is an empty room and the right kind of people."