Dizzy Spells

I am 34 weeks 3 days pregnant and for quite a few weeks now I have been having these terrible dizzy spells. I get extremely hot, start sweating, and get so dizzy and light headed my eyes start going crossed and I really feel like I’m going to faint. It started only at work at first in the back room that we do oral surgeries in, it gets so hot in there even before I was pregnant so I just assumed that’s all it was and I was getting a little overheated, but then it started progressing where no matter where I was if I was standing for any length of time it would happen, & now it is to the point even sitting down I’m having these spells. I know you guys aren’t doctors, but my doc appointment isn’t until Friday so I can’t ask him until then 😭 if anyone has answers (other than anemia) please let me know 💙

Edit: I also drink a lot of water and constantly eat, so I know it isn’t that. & my blood pressure is always perfect.