Hi there. These symptoms could be due to a chronic degenerative neurological disease called multiple sclerosis, where you have tingling, numbness , weakness of limbs, fatigue, cognitive dysfunction, visual blurring and distortion etc. you need to show yourself to the neurologist again and get this ruled out clinically, cerebrospinal fluid examination showing oligoclonal bands, MRI brain showing white plaques of white matter demyelination. Hope this helps. Take care.
Which part of your back was the MRI done on?
Was the MRI of your brain done WITH contrast?
Any NCS and/or EMG testing done?