If you aren't seeing a Gastroenterolgist you really need to. It sounds like severe constipation, but you need to know for sure and a GI doctor will know what to do.
Curious what, if anything the doctor suggested was the cause? Is the doctor a specialist or a primary physician, and has this been an issue previously?
Know it is scary to have such bathroom drama. Have the doctors suggested a cause of irratic bms?
Irritable bowel syndrome is a common disorder that can cause body to swing from diarrhea to constipation in a day.
Best is to contact doctor and let him/her know you are still suffering.
As you posted in the colon cancer forum I am guessing you have a fear of this cancer. Be very honest with doctor about your fears as well as the symptoms. There are a variety of tests available if cancer is suspected.
Best...