Try TCM at Kwong Wai Siew Hospital. Ask for Prof Chia. It's evening clinic and Prof Chia is not always there.
Check with TCM Clinic when Prof Chia is available.
Consult an ENT specialist. The specialist may want to do a CT scan head. Something is wrong with the nerve. It may not be a life threatening problem. Find out "WHY"... & go on with life. :-)
It has nothing to do with your eyes. It's just muscular reaction in response to stress. Different people has different reaction. Don't waste your time visiting Neuroscience, go for relaxation programs such as yoga and meditation, Chi-gong, or even psychotherapy.
Lots of illness come from the mind, how you think, what you think and why you think. Change your pattern of thoughts and free yourself. I do believe you had underwent some kind of emotional thing sometime in the past or recently.