Got majorly hot & blacked out

I’m 11W 3 Days, I was standing to cut hair. Nothing out of the norm really. I haven’t done it in a while. But I usually try to sit. I stood today... but started to get super hot but still felt ok. Went outside with my friend and I was seeing spots and felt super weird. I hurried and sat down. I immediately was in a total body sweat and was burning up and fighting passing out. It passed within 5 minutes and I never fully passed out. But has any one else experienced this? I have a prenatal with iron? I ate and drank fine today. Nothing with tons of carbs. I’m wondering if my sugar dropped or I just got too hot?? Scary.