4 yrs ago i was diagnosed with bells palsy on the right side of my face. now the left side of my forehead above my left eye is twitching. why?

Myokymia: Eyelid twitching is common and benign. There are no real treatments for this except tincture of time. Some have found that supplemental calcium helps shorten the episodes. This is not related to the Bell's palsy on the right side. Usually this is self-limiting and does not progress.

Cause may be unknown: Twitching inside a facial muscle, which happens in normal people, is called myokymia (an involuntary, spontaneous, quivering of a few muscle cell bundles in a muscle). Myokymia starts and stops spontaneously. It can last a few minutes to a few days. One should see her primary care doctor, or an eye/ear/neurology doctor, if symptoms persist, keep recurring, or are combined with any other symptoms.