It sounds to me like it could be a thyroid disorder (hyperthyroidism) or possibly be your adrenals. Many of your symptoms seem to be shown here http://www.mayoclinic.com/health/hyperthyroidism/DS00344/DSECTION=symptoms.
Also, many doctors won't check your thyroid and adrenal levels on regular blood tests (unless you ask for them directly). For more information, try going to http://www.agemanagementoptimalwellness.com/
and clicking through their links to see if that may help you.