Starting on promethazine

Emily
I'm starting on promethazine tonight for really bad morning sickness. I'll be 7 weeks tomorrow. My husband and I have excellent insurance but they wouldn't cover diclegis and the promethazine still had a $250 copay. I wish I could power through, but after nonstop nausea for 5 days and throwing up 6 times in 4 hours this morning alone I just couldn't take it anymore.  
Has anyone taken promethazine before? What were your side effects?