Helllpppp please!

Abigail • Pregnant with #2 & twins this time!
I'm 12 weeks pregnant with twins. All day today so far, I've been trying to relax but literally every time I get up, I get dizzy and light-headed like I want to faint. Nothing is helping it to stop and I definitely didn't have it with my first pregnancy. Am I the only one going through this? Is it normal?