From what you've described it sounds very much like Dysautonomia. With it, the symptoms are so wide and varied that it can present as both "everything" and "nothing" at the same time due to the general tests being run coming back normal. When that occurs, a less than knowledgeable physician will suggest that it is psychosomatic, which anyone dealing with this condition knows very well that it is anything but.
Given that Klonipin is working to stabilize your symptoms, I would speak to your doctor about starting a low dose SSRI which for many of us has reset the nervous system, putting an end to the more disabling symptoms.
Starting one may cause even more disabling symptoms at first, as it did for me, but once tolerated it has worked quite well.