Eye tweaking. Any help much appreciated.

It's been more than couple of years now over been facing this problem. It come and goes. I'd been told before that fatigue, less sleep, stress and more caffeine are some of the symptoms. Also B12 deficiency sometimes could be the reason - General Practitioners in India said. Essentially, it cured for a while when I took B12 injection. My right eye used to tweak before, now both. It was minor tweak at the tip of the eyes before, I feel it is more severe than it used to be. I need expert neurologist (or someone who is aware with nerves and stuff) advice on this. Please advice what would be the problem other than fatigue, sleeplessness or more caffeine intake. I simply want to get it cured medically. Any help much appreciated. Thank you.