Diane my lovely.
If I was you get yourself admitted through A&E. You can't go on for 3 weeks with this pain, if morphine wouldn't touch it you obviously have a problem.
I am stunned that the hospital sent you home without doing the scan, but I am equally stunned that your doctor didn't insist on you been admitted. I have a young neice in pallative care and I know what doctors can be like, keep fobbing you off. Get yourself sorted my petal before it gets worse.
Please take care of yourself my petal.