Someone can correct me if I'm wrong, but aren't the side effects kind of an average?
My wife had the full-on misery for three days, felt a little better the fourth day, and fine by the fifth day (but with a headache that lasted for three weeks). Others we've talked to have had lingering flu-like symptoms for as long as a week. (Though to be fair, both of those people are hyperbolic in their illness issues.)