Extreme morning sickness?

I've been dealing with constant nausea and vomiting since right before 6 weeks. I'm 7wks3days now and i can't take in liquids without becoming extremely sick. Thrown up 3 times and now it's just dry heaving cause i don't have anything in my stomach. Been taking unisom and b6 with little relief..doctor prescribed diclegis yesterday but it's still pending insurance approval and i can't pay 500$ out of pocket for 30 day supply.

Really not sure what to do at this point, i can't function, can't stand without getting sick to my stomach and extremely dizzy, but feel like it's excessive to go to the ER.