Diziness , Heavy Eyes and Pulsation.

Having dizziness , heavy eyes , palpatation since last 2 years. Underwent all necessary tests including MRI and all came clean. Consulted ENT specialist, Eye Specialist , Neurologist and Psychiatrist. Doctors say that these symptoms are due to stress and anxiety whereas my body refuses to accept this.I do have anxiety but this has happened only recently because the symptom of dizziness and imbalance are not getting diagnosed. There are no specific triggers but it happens mostly in standing position and when there is too much of lights around. eyes become sensitive towards light and the dizziness persists. I feel i might just fall down and will become unconscious but fortunately nothing of sort has happened so far. Tried various medications. Please help