tight bands??

Has anyone ever felt like something tight is wrapped around your arm or leg. It kind of feels like I have an elastic band around it. I have been getting this feeling recently and it is really freaking me out. It only last for a couple of seconds but its really wierd. Along with the wierd numb but not numb feeling...(hard to explain but my leg feels like the muscles are numb) I've been getting in my legs this is really worrying me. I've had an mri a couple of months ago to rule out ms so I don't know what it is???
Help!! :unsure:
Melissa