H/aches for months had mri to look putirity glan could they missed somthing serious causing headaches get dizzy, pressure like going to faint, 7 a day?

Not in head: Mri is very good at seeing details in the brain. Unilkely to have missed anything causing those symptoms. In fact, the aggregate of symptoms suggests that the cause is not a problem inside your head.

Nothing Structural: While a MRI of the brain is useful to look for any structural reason for your symptoms it tells you nothing about function. Thus if your problem is related to a functional disturbance of the brain (i.E seizures, metabolic disturbance...) a MRI will not discover the cause. Hence, you should have a consultation with a neurologist to uncover the cause. Good luck to a speedy recovery.