Thanks for interacting with the experts at Just Answer
Your concern is quite understandable
Your symptoms are quite consistent with the diagnosis of Ocular Migraine
While an MRI should certainly be done to rule out the less likely possibility of a tumor / demyelinating disorders (like MS etc.)
BUT it is very likely that the results would be normal, or consistent with the diagnosis of Ocular Migraine
Do get back for any clarification
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Thankyou both doctors for your replies, however......How do you explain the left pupil dilation, assymetry and constant throbbing in my head with no pain? Information i have received from other sources say that these symptoms could be of greater concern. I have gone back to another doctor today who has disagreed about the migraine diagnosis that everyone seems to be giving me and insists on me having either a CT or MRI scan tomorrow? How common is single pupil dilation? Why am i so dizzy? I have been dizzy all day with no headache now. I am also hearing a high pitch piercing sound constantly in my ears, what is this?