Dizzy!

My Name?
I'm having a light headed dizzy feeling, Normally while standing or walking. Are any other mommies feeling this way? I had this problem my 1st pregnancy & doc told me it was my blood sugar low, just to drink a coke & I'd feel better. I had this feeling while sitting down today & a dr. Pepper didn't help. Could it be bc I'm having twins and it's just the extra   hormones?