First get all the Urishiol off of you and all your gear. Skip the bleach and anything harsh on the skin, as all it does is irritate and dry out the already irritated tissues. Plain old dish soap, simple Green, and any good degrease will do. The Urisiol is what causes the allergic reaction, and the histamines generated by your own immune system are what you are left dealing with.
Technu is good stuff for getting the crap off, and providing pretty good Itch relief.
Benedryl helps keep the itch down from the histamines, as will running warm to hot water on the affected area, as it will drive the histamines from the affected tissues. Hot as you can stand it, but don't get to burning yourself.
Next, head to the local Mexican store, where the local ag working Migrants get thier chow and do all thier western union business.
ASK for the mexican poison ivy cream, as it will be out of site under the counter.
Usually it will be "Qudraderm NF" which is sold OTC in mexico for like 10 bucks, and costs about 30 bucks after they bring it here.
The stuff flat works. Better than script Diprolene by a good margin. Kills the itch, and has both Sulfur and an anti-biotic component in addition to Diprolene.
If it gets bad, get to the doc for a med pack of prednisone. The crud CAN go systemic and can do some real damage including killing you.
Double wash all your stuff and remember to run a decontamination cycle of the wash machine. No point in recontaminating yourself or somebody else in the house.
Good luck with the crud!!
Just getting into our own "Poison Ivy season" here, and dangit does it suck!
Stay safe!
Dingeryote