Both me and my wife had standard flu last month. It's pretty shit at the time but actually for me the worst bit was the slow recovery. Just felt knackered all the time. It's been years since I had a virus so I just expected to be fine after a few days, like when you have a cold.
As was said to me in the early 90s by a uni tutor - if you wouldn't crawl across a ploughed field to get to a £50 note then it is probably flu. May need adjusting for inflation.
Cheers all. Think I am through the worst bits