Did I have a stroke and if so is it causing all or any of these issues?

I'm hoping this is the right thread and I can maybe get some helpful answers since I can't get them from the VA (Veterans Administrationi Hospital). On Dec 7th, 2013 my wife and I were on a trip and I went to get out of bed that morning and found it impossible to do without falling over or back into bed. On the day prior, Dec 6th I was fine. When I say 'balance loss' I mean I don't get dizzy or have vertigo. I will be standing in one spot and suddenly fall off to the right, left or backwards. The same thing is possible if I'm walking even with the cane I'm using I may suddenly go off in another direction. In Jan of 2014 I had a VNG (Videonystagmography) test at the local VA hospital here. The results I was given were: Test results indicate abnormal tracking and fixation suppression which suggests a central lesion. Fixation suppression and tracking mechanisms share central pathways. Additionally significant down beating vertical nystagmus was noted in the head hanging position which is also indicative of a central lesion. The audiology clinic there wanted to refer me to the ENT clinic however they kept saying I needed to go to neurology which I finally ended up doing. I'd like to note that due to having two neural stimulators implanted in my back I can't have an MRI so they've done two CT Scans of my head which have shown nothing abnormal. My neurologist has tried 4 or 5 different medications to stop this to no effect. I've done three months of physical therapy on a machine called a 'balance manager' with no change. I've been to the ENT clinic where the doctor there said: ASSESSMENT: Dysequilibrium problem is likely of central origin. I strongly doubt an inner ear issue, with normal hearing and the videonystagmography (VNG) pointing towards a central lesion. I really have no further suggestions at the present time Another issue I have whether it's related or not is that if I stare straight ahead and move my eyes to the right they feel like the have to 'snap' back to the center position at the same time my head will start to feel odd as if it's spinning. This doesn't happen when I look to the left like this. After going through all of this my neurologists says "No way you had a stroke and since you can't have an MRI all the tests that can be done have been done, nothing else to do. I have all kinds of records with complete test results of two VNG tests I've had done and results of my 10wks therapy on a Neurocom Balance Manager.