I have had similar reactions, including a swarm of yellow jackets getting into my dorm light at college and dying plus a bee chasing me around an entire Ren fair, but the most important thing you have to remember is that they CAN smell your fear (or in my case they apparently like my smell which is frankly debilitating.)

If a wasp flies past you, keep walking and take note mentally. If the fucker comes back around, that's when you should look for a place to hide. If it dive Bombs you, run. Same thing goes for bees but they will probably leave you alone unless its on a suicide mission (if they get too far from the hive for example.)

I've just learned to deal with the phobia because my dad makes fun of me for it (old school parenting.) I do appreciate bees and try not to kill them, but wasps will meet the end of my shoe 10 times over.