diclegis withdrawal ?

Hi ladies! I'm overdue and I had been taking diclegis since around 6 weeks of pregnancy. I just ran out of my prescription and am being induced in Monday so I thought I'd stop taking it all together since I'm about to deliver anyway.  The problem is, ever since I've stopped taking diclegis I've had HORRIBLE headaches. Has this happened to anyone else? I can't wean myself off because I have no more pills and don't want to fill my perscription of 90 pills if I'm giving birth next week. How long will my headaches last? They're horrible 😩