Uterus pain back pain

Hi I'm new to this .... I'm very concerned I had a miscarriage in February and for the past 3 months I've been having horrible very painful pain in my uterus area. It hurts to pee,poop,sit,stand,laying down... I've had several US bloodwork is normal and have even went to the ER! Does anyone know what this could be or what other test I can get? Seeing a new OBGYN in a couple days . Thanks