Fluttering/twitching in upper left abdomen. no pain, similar to an eye twitch. should i be concerned?

Cramps and vibration: The feelings of twitching is usually caused by small muscle contractions and relaxations just as in the eye. Often too small to see. That is very similar to a cramp which is the same thing but it keeps recruiting other muscle cells to contract and not relax. Try stretching your arms over your head and take deep breaths to stretch it out. You probably had minor injury which will heal.