Daily twitching eyelid on left side with headache over eye that comes and goes. sometimes neck pain or pain on back of head also. eye is dry also.

Need more info: It is not uncommon to have intermittent twitching of any muscles of the face. However if it is continuous or the entire face twitches then needs evaluation especially if there is hearing loss or vertigo. See ENT or neurologist.

No simple answer: The most common cause of achy pain around the eye that i see, comes from irritation of some nerves in the upper neck near the base of the skull. When they are irritated, there may be a tender spot to pressure over them in the neck but the body may be most aware of the pain felt around and behind the eye - called referred pain. For this particular cause, tratment must be delivered to the neck.

MRI of the brain: get MRI of the brain , if normal see ophthalmologist and headache specialist .