I have an over active thyroid and I've been feeling dizzy and my vision gets blurry what should I do?

Get treated. See your doctor to get the hyperthyroidism treated appropriately. The treatment depends on the cause of the hyperthyroidism but there are many treatment options currently available. You do not have to suffer with untreated hyperthyroidism.
Blurry vision. Thyroid problems are commonly associated with dry eyes. I suggest that you try the frequent use of lubricating tear drops which may help your blurry vision.