Anxiety or Neorological

At age 34 I had an episode of Optic Neuritis but no MRI to confirm demylineation and a diagnosis of IBS. At age 42 I had 3 eplieptic fits diagnosed as 'tendency to eplilepsy'. At age 48 I had another severe bout of Optic Neuritis, followed by an abnormal MRI when the neurologist said that any more episodes and he would have to declare MS. I am now 53 (just come through a difficult menopause) and in the last 5 years I have had episodes of vertigo, constant problems with blurred / double vision, more digestion problems, constant sinus trouble, forgetting words, inability to take all the information in when I am in crowded places which leads to confusion, foggy days, several falls which have left me with some quite severe damage to limbs. I find myself constantly watching my feet now and have real difficulty negogiating steps and rough terrain. In the last 12 months I have had impingement in my right shoulder which has left me with Chronic tendonosis of the bicep tendon and now to cap it all I have been diagnosed with 'overuse injury' in both knees exacerbated by a degenerative torn cartilage in one knee!!! which may require 6-8 weeks of work. I have a very demanding job and have just handed in a difficult part time PhD. My visit to the neurologist this time has resulted in him suggesting that my symptoms are possibly anxiety driven although he has suggested another MRI should be done to "show me that there has been no progress".  This really surprised me in view of his conclusion 5 years ago. My question is could all this have been brought on by anxiety rather than neurological causes and what about the physical problems - shoulder and knees?