Seems to be a few bugs going around and I think I had the same as you on the weekend.
The symptoms were like a mild cold (Not the flu, I've had the flu before and it's no joke)
Mild sore throat, cough & a bit of a temperature. Normal circumstances I'd dose up on over the counter meds and power through it, but this one seemed to sap me of all energy for several days. I spent all of Friday in bed asleep. I'd get up every few hours to chug a pint of water and use the bathroom and it usually took me a minute or 2 to get steady on my feet.
Saturday, I was a bit more alive, but a 10 minute round trip to the chemists felt like a marathon and I was soaked in a cold sweat and completely out of breath by the time I got back. Didn't start feeling completely human again until Sunday night.
Feeling mostly OK now, but still have a very mild but persistent cough that doesn't seem to be clearing.
Booked in to see my GP next week for a flu shot as I don't wanna be taken out by that as well