For 3 mos i've had on/off aches, tingles, twitches, restless feeling, mild pains in legs, mostly left. no swelling or localized pain. possible causes?

Tingling & twitching: Your twitches may be related to any number of reasons including anxiety disorder, stress, stimulant overuse (for example, caffeine), overexercise, nutritional deficiencies, electrolyte imbalance, etc. See your physician if you are concerned. Here is some more information: http://www.nlm.nih.gov/medlineplus/ency/article/003296.htm