I use Benadryl gel, it has lidocain in too if I recall. Before I ran out to get that for skeeter bites last year I used Preperation-H. It has lidocain in it too,
Preventative, I have used vinegar in the rinse water instead of perfumy softener.
Add a can of Off to keep close. I have a small pump one with a clip to my bag for work. I am out doors for much of the field work. Everyone ask why the bugs are not bothering me as they swat around.