Girls, please tell me what to do! At night, muscles were hurting in th…

Girls, please tell me what to do! At night, muscles were hurting in the area of the stomach, by morning the pain shifted to the right lower corner, almost not painful at moments, but as soon as I get up and literally take a couple of steps or stand on my feet plus when I'm completely urinating, it starts to hurt badly in the back and radiating into the lower part of the spine, also on the right side! It happened once before, but it passed itself and within a few hours... There are no discharge, what could this be, maybe anyone encountered? Could this be something serious? Should I call an ambulance? (I just put Vibrucol, hoping it will help)