I Have A Difficult Time Deficating ,,,,went To Several Doctors

I have a difficult time deficating ,,,,went to several doctors
with different opinion ,,tried everything ,including diet chage etc

I had a colonoscopy ,,and they found nothing wrong
I hid have hemerhoid surgery but did not help the situation ,,
doctors tell me it not hemm s

nothing works
feel like my resctum swells up whe I go to the BR

feels like bowel movement it going thru an area that it so narrow ,,