I don't know the cause of your "dizziness." Are you referring to being "lightheaded" or does the room actually spin around (true vertigo). A diabetic with hypertension and history of Meniere's syndrome and TIA - all could relate to lightheadedness.
I gather you are under the care of a physician; by all means discuss your symptoms with the doctor to help clarify the origin.
Please keep in mind that I am unable to diagnose medical conditions online.