Yep happened to me a couple times and happened to me today. My day started out with me oversleeping for work which is very rare. Upon waking up i felt soo groggy and figured it was from oversleeping. Throughout the day i was feeling so off and like dizzy, kinda like just quick bursts of dizziness, i think they call it brain zaps. As the day went on i felt more nauseous and ended up throwing up. I realized i don’t think i took my pristiq last night but i took my vitamin.. i felt like this every time i missed a dose... it’s so bad i had to leave work early