I think Tamiflu is awful! All three of my sons got the flu this year, and were prescribed it. It made all of them violently ill, making them throw up. I was prescribed it for use as a preventative, and after taking just one dose, I felt so sick. I think I'd just rather wait the flu out than take that horrible stuff again...
And for ages, I've always heard people say that a really high fever will make one "delirious". I know when I have a fever, I feel very out of it. I guess what the fever's toll on a person is, varies.