The head pressure and dizziness
can be due to varied reasons inspite of normal mri. The diagnosis depends on the frequency duration and location of head pressure. Head pressure and dizziness are not typical of migraine
. Migraine is classically a unilateral throbbing headache
with vomiting. Your symptoms may be of stress related or of a raised intracranial pressure. U may need to consult neurologist
to rule out raised intracranial pressure.