Sscyco!
I think you could be right about the wasp sting having an adverse affect on me.
By a strange coincidence a friend i have just seen was full of a disturbing inccident on Sunday also.
She was at a local open air show and they bought Icecreams as it was so hot.
Whilst licking her Icecream she had not noticed a Wasp had landed on it, for its share, you will probably guess the next part,
The wasp stung her in the mouth, almost immediately her tongue and cheek started swelling immensly, they found the first aid centre, who seeing her predicament summoned up an Ambulance to whip her post haste off to hospital, by this time the swelling was so bad she was starting to choke and unable to breath.
Fortunately quick treatment at the Hospital reduced the problem and she was soon o/k to go home.
This is kind of scary . From now on at this time of the year I am going to keep my mouth firmly closed while on the bike .