There could be various causes of dizziness including low blood pressure due to anemia, bleeding
and dehydration, heat cramps, exhaustion, high
blood pressure, cardiomyopathies, conduction discturbances,diabetes both hypoglycemia and hyperglycemia, endocrinal disorders like hyper and hypothyroidism, addison’s disease, vasovagal syncope, etc. since you had back issues, you need to be evaluated for a disc herniation at the cervical or thoracic spine level.