Noted the history and understood the concerns.
Your meaning of constipation
means passing hard stools with force in spite taking many laxatives.
I would advise you the following in such a situation: Consult a Gastroenterologist
X-ray of abdomen in standing position to see for fecolith formation as your trans-vaginal ultrasonography
has shown so. If present then you need water/saline-soap enema for proper evacuation. This will help evacuation of the hard fecoliths and thus may help regularize the bowel.
Further cleansing of the bowel for preparation can allow colonoscopy
Other tests as needed.
This may give a reason for hard stools.
Ano-proctoscopy can help to see for the hemorrhoids, its degree and plan for management.
Stool softeners are needed more than the laxatives.
Dietary changes to stop the foods and beverages and cause hard stools may help further.
Hope I have answered your query. Let me know if I can assist you further.
Dr. T Chandrakant,