I live in Sydney Australia, I went to a music festival in the blue mountains next to a river! I was lying down on the ground without a t. Everyone reacts differently to stings and bites and should seek medical advise anyway, just incase! After reading some of these posts I think in hindsight I should have checked it at the local surgery?!. I asked the guy at the cafe if there's anything to worry about and he said no, and gave me some bite cream.
Just back from Corfu, I was digging in the sand in Sidari and got bitten or stung by something! My finger was in immense pain & then went numb, it travelled up my hand making my joints in my hand ach.