Woke up to anxiety??

So whenever i get anxiety i start to get super hot like a huge hot flash comes on me and  i start to gag or throw up for some reason and my heart beats fast.... idk why but right now i woke up super early and was feeling that i'm calming down now ... i took magnesium... But i feel REALLY!!!! Nauseous!! .. Why do i get anxiety in the mornings after i wake up? is it because my mind is freshly awake ?