Thank you lisa for replying to my question so quickly.
My answers to your questions are yes - I had all the blood tests testing for other diseases and they were all fine. I have seen a neurologist who did various tests like making me walk in a straight line, resistance tests and tapping my fingers etc.. I passed all the tests except for when standing with my eyes closed I fell slightly to the right and I had descreased feeling in my right side when he did the pin prick test.
My mri scan of head and neck lasted 40 minutes and they didn't inject dye, the scan of my head showed non-specific high T2 signal abnormality in frontal subcortical white matter (what does this mean?) and the scan of my neck showed I have mid cervical c5/6 left paracentral spondylotic disc in the absence nerve root impingement or cord compression - could this be causing the numbness in my arm/leg? The neurologist also writes in his letter that he doesn't think my mri results is relevant to my neurological history i.e. I was referred because of right sided migraines and numbness in right side (see previous email). What does he mean by that? I am awaiting an appointment to go back and see him but if you can enlighten me a bit more so I know what to expect then that would be much appreciated.