Headaches after a miscarriage

I had a very early miscarriage on the 24th (baby stopped growing at 4 weeks and miscarried when I would have been 7 weeks). I have had very bad headaches for the past 3 days. Is this normal? My doctor is supposed to call me today with my current beta levels and I'll ask her but they're so not helpful. I've read online that it could be my levels dropping fast. Is that true? I'm getting worried because they hurt so bad that I want to throw up and stay in bed with all the lights off.