Thanks for all the replies - @mydogisnamedslippy I don't mind MRIs that much but I hate the scans that include an iodine drip - hate needles and hate that feeling of heat running through me.
Anyway I'm having the test due to 3 years of facial sensations / neuropathy and most recently a ripple like movement of muscles in the one side of my face (happened 2 x lasted a few seconds but damn scary) - of course google tells me these are either MS or brain tumour or something worse
so am terrified not of the tests but of the results.
Assume another scan will be done.
Am less concerned re tumour as two previous brain scans (last in 2008 I think) were 100% clear. But was never given a spinal MRI so concerned about MS or worse (apart from this face stuff I also have other symptoms, some of which are no doubt just anxiety, others.... not sure)
Anyway thanks again.