Am scared

Hi moms I am 36 weeks 3 days I am very scared yesterday I called my midwife and sent me to the hospital for a check up I have had a lot of lower back pain for the past 3 days and my belly kept getting hard like I was carrying a rock inside .... I no longer felt my baby's movements. But at the hospital they couldn't tell what was really going on… they just assured me the baby is okay… but I'm afraid. I now hear very little and little kicking but my stomach is still very hard and a lot of back pain... has anyone ever experienced this???? Am scared