Girls, I'm in bed rest, I'm afraid I slightly felt dizzy when lying do…

Girls, I'm in bed rest, I'm afraid I slightly felt dizzy when lying down, they put blood-stopping and magnesium, my heart was heard on Tuesday, but it doesn't match by dates (small). My neighbor has the same thing and froze, as they said from ultrasound, but she is 6 weeks (I think not always hear the heartbeat at such a late stage). In general, I still walk with terrible headaches, they put two painkillers in half an hour, and all three days I suffer with my head, won't injections harm me? Although I'm worried, I can't stand pain.