Just because they may "say" that "nothing's wrong"...Doesn't necessarily mean that there "is" nothing wrong...
It just means that by clinical evaluation there are no found abnormalities..
Difficult to get at when you're in pain, isn't it? I can't imagine that when I get my tests and results back, them saying "nothing's wrong" and kicking me out... Pain is pain...
All you can really do (and this is not going to sound like much help), is keep seeing "a" doctor of some sort...Until the problem is found...
I'm not of much service when it comes to 'costs and healthcare programs'...Appologies

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Whatever happens keep posting us!