I don't really know how long I have had it. I just started getting really tired and weak and my eye drooped. I thought it was my sleep apnea. When my sleep apnea doctor saw me He said I should see a neuro doctor. For years I had many things that the doctors thought were TIA'S. I have nystagmus which developed in my 40s and strabismus in my eyes. I now think it may be due to a muscle weakness in my eyes. My arms and legs seem to be getting weak also. My neck and back are starting to give me some pain and stiffness. This sounds like I am whining I am sure. Sorry