For the past few days I have had really achey legs..

They really ache.. mainly in the thigh area but it radiates down the whole leg...

Its feels sortof like I've been doing heaps of exercise, it feels a little like that but more dull... and so constant, all night.. I can barely sleep and now its at the point where I can barely think of anything else...its just always there....

any ideas whats going on?
Has anyone heard of this?

I have no other illness stuff going on at all....