Still so nauseous!?

Ally • I'm Mom to 3 beautiful boys. I'm excited to add a 4th little BOY to our family!
I'm so worried about myself...  I'm still so nauseous! I'll be 16 weeks this Friday and if I don't take Diclegis, I cannot function or keep anything down.  This is my 4th pregnancy and I've never experienced sickness like this before.  I also have a full headache... Is anyone else still experiencing sickness?