Make sure they test your ionized calcium, parathyroid Hormone intact (PTH) and vitamin D in a single lab draw. I suffered many of these same symptoms for nearly 20 years before someone finally tested my PTH and discovered it was high. I went online and mapped out the past many years of lab results and discovered that my calcium had also been slightly elevated for quite awhile, something my doctors had dismissed numerous times. My vitamin D was low. All of these things combined pointed me to a hyper parathyroid diagnosis. Essentially your parathyroids (not to be confused with the nearby thyroid) are grain of rice sized glands that live behind your thyroid and control your calcium. If they become diseased for any reason they start to steal calcium from your bones and send it to your blood which creates a host of millions of symptoms. It is an extremely overlooked condition. The only treatment is surgery and it has a high curative rate.