Flashing dots of light, cold tingling in random body parts, ringing in ears. Like migraine aura but has gone off and on for days w/o headache. Cause?

See your physician. These symptoms may represent sinus issues, anxiety, a specific kind of headache or other neurological condition, etc. You should keep a log of the location, timing, duration, characteristic, and intensity of these episodes and take the log with you to your physician. You might be referred to a neurologist. http://www.nlm.nih.gov/medlineplus/ency/article/000647.htm.