Cluster tension headaches

So before i became pregnant I was prone to cluster headaches. That would knock me down and out for a couple days. I thought they were done and gone forever. I wish right, well i got hit with one on monday. Since I am pregnant I cant take my normal headache medicine. My midwife and PA prescribed me reglan to try and help with the headaches. I had never heard of reglan to help anything but nausea. I really hope this works!