I have been thinking the same thing. I got one hell of a rash all over my body. My eye swelled shut and my face looked like crap. I went to the emergency room on sunday (no health insurance so no regular doctor). The doctor took one look at me and said I have Contact Demititas from poison ivy, oak or sumac. She perscribed prednisone. I have been taking it for 5 days and am still breaking out. I got this rash on my hands, belly, butt, armpit, leg, neck.....I am begining to think its from a critter. No one in my family has developed the rash.I think after 5 days of meds it should be alot better.
I've had contact dermitits several times. It is awful, especially being a hunter and trapper. My problem is I am allergic to wet plants!! Tukey season can be just one giant itch!!!

Have you tried any Benadryl yet? Try some topical cream on your skin and Benadryl pills for the rash.
Be careful! Benadryl can cause severe drowsiness. 
It is also used for over the counter sleeping pills!

If your family hasn't been affected it probably is not a critter, but I am not a doctor. Usually critters will make the rounds through the family.
I hope you get some relief soon. The itching is enough to drive you crazy!!

We used to put perfume on the itches when we were growing up. Sounds silly, but it would make them hurt and not itch.