I been kinda tired the last couple days with dizziness and this morning I was out of it and had a headache. Any clue?

Could be sleep apnea. This sounds like sleep apnea until proven otherwise.
Likely not serious. Most headaches not serious. However, first your doctor will determine what type of headache you have. Headaches have many causes i suggest you see your physician and discuss a plan to determine the cause. Your doctor might order imaging of brain and optic nerve exam to rule out serious conditions.