I always keep a tube of Anthisan with me - it's the best cream I've come across for bites and stings and sorts the itching and swelling pretty much immediately - you can get it from Boots and supermarkets.
If you get bitten while out in a bar/restaurant tip a little Efes into the palm of your hand (or any liquid for that matter) and mix with salt to make a paste then plaster on the bite - that soon stops the itching too.
I don't find the little buggers so troublesome in Icmeler but they do spray the roads regularly which I think helps.... the wasps seem to seek me out on the beach though, so I have a tube of Anthisan which lives in the beach bag and another tube that lives in the evening bag - in preparation. Uuurgh makes you itch just thinking about it!!
Mazz