Yours sounds like my first case of Poison ivy, not that I've ever had it again.  Thankfully.  I tried everything at first.  Nothing seemed to help and it continued to ooze, blister, the intense itching alerting me every four hours.  Being an herbalist, I formulated a natural product which I am very proud to say works.  After a few days, it was completely gone.  If interested, you can get more information at www.rabbottsremedies.com.  I also recommend that you should also drink teas that are blood cleansing.  Burdock tea is a good one to start with.  Good Luck