thats good about the ultra sound, i might go down that route if all else fails, i some times can get up from sitting down or lying down and sort of stretch my neck back and look to the sky and my sternum cracks and it feels sorta good{weird i know} thats could be something to do with my chest,,,
might just have to come to terms with it soon and deal with it because im dying to get on a course soon,, lol