Missed misscarraige?

Im

Help! I already called the nurse on duty and she said to go to ER IF i truely need reassurance. I havr had a massive decreasd in breast size in the last 6 hours and i do t know why. Im 10 weeks exactly and have no other pregnancy symptoms. Reading about those missed misscarraiges on this site has me so worried and paranoid that i might be having one. Women post them all the time on here so they seem so common! Im so scared. My breasts at least have always given me reassurance that im still pregnant but now they are my prepregnancy size and notnsore ore tender. I cant sleep i am so worried. Has anyone else experienced this? Please i feel so alone.