I swear I live my life dizzy
There are a couple issues that could cause dizziness. It could be sinus issues causing imbalance.
Another issue is low blood pressure. Is your blood pressure usually low? I have really low blood pressure and sometimes I need to make sure I increase my sodium or I'm careful about transitions (laying to standing quickly doesn't work well). It could be that your blood pressure was low and blood was going to your muscles and your brain started lacking so you went dizzy.
Final issue is low blood sugar. I need to eat an hour to a half hour before I exercise or else I'll pass out. Had you eaten prior?