Must be the stress???

Alright, so my legs are driving me absolutely mad!! They are all itchy and tingly, like bugs are crawling on them or something.... I could barely sleep last night! Today, I was absentmindedly scratching, and I scratched so long and hard that I have a big ol' bruise on my leg now! It's horrible! What could be causing this?? Looks like a double Exc*drin PM night for me!