The " just run it off " standard medical operating procedure of the Parachute regiment is no good you say ?A mate of mine at sandhurst was ex para and felt a bit rough one day so he wrapped himself in lots of gear, including his watrproofs, and took himself off for a long fast run in order to sweat it out.
He was scraped off the side of the A30 after collapsing and rushed to hospital where he spent the next week or so in intensive care. The cold/flu he thought he had was in fact meningitis and it very nearly killed him.
So take great care. Do not be a big girls blouse but at the same time if things persist or worsen call 111.