Fainting spells

Devy 🌺 • Pregnant with my 2nd!!

So I'm 24 weeks, and I've been getting these fainting spells. Where my ears would start ringing and my vision goes out. I work often so it really only happens when I'm at work. What do you guys recommend? I work at Macy's so I'm on my feet about 7 hours. I notice that it's really bad when I'm hot. But I don't have a plug for a fan.