Get a different doctor -- my sister went through this 18 years ago and it turned out to be very serious -- please don't take any chances and see a doctor that will (either ob/gyn or gyn/onc) that will do a CT scan -- this is not normal.
I hope you feel better -- Fight for yourself == no one else will do it for you
Good Luck
Sorry about what you are going through right now. Please go to the dr again or find a new dr (GYN) who will listen, Have a CT or MRI scan or repeat of the US to start with. Bottom line is you need to be very strong to be your own adavocate of your health to find what is the cause of these symptoms.
Best wish
Peace and Love