Postpartum..chills?

So as of last night I have this thing where I'm fine when sitting, but when I get up I get super cold and start to shiver which makes me nauseous. I can't stop shivering for a solid 5 mins of I push it and don't sit right away. The colder the air is the worse it is. But under a blanket or in a jacket I feel too hot. It's better than freezing so I deal, but then when I sleep I get the sweats. Is this normal? Had to miss my dr's appt and it'll be awhile before I get to see him again.