Sudden dizziness that lasts for a second

I’ve been getting dizzy and it lasts for a few seconds and it goes away. Last week it happened to me for 5-10 minutes and I felt weird a few days after. I went to my doctor and he checked for vitamin and ran other labs and everything came back normal. I’m wondering what this can be and what the cause of this issue is. I’m type 2 and my last A1C was 9 but recent for the past month I wake up with sugars or 120 or 180 max.