I had a muscle cramp in my shoulder for a couple of days and then have had an episode of vertigo and fatigue. just want to sit still and sleep.

See your physician: These symptoms may represent anxiety, spasm, electrolyte imbalance, a specific kind of headache, or other neurological condition. You should keep a log of the location, timing, duration, characteristic, and intensity of these episodes and take the log with you to your primary care physician. http://www.nlm.nih.gov/medlineplus/headache.html , http://www.nlm.nih.gov/medlineplus/panicdisorder.html