There are a couple of stretches you can do on the IT band. they quite hard to describe by text, especially so close to bed time! PM me tommorrow, and I'll give it a go.
I can recommend a cracking physio in newcastle, who sorted this injury out for me. He ran his elbow and all his body weight along the IT band for about 2 mins (excruciating pain!) and gave me 3 stretches. Never suffered with the injury again!