I had a 22 hour bad trip where a shadow demon chased me around my room and made the walls ceiling and floor look like it was covered in rot, mold, and decay. The first few hours was pure bliss though.
I did start to write the trip report but as soon as it started to take turns for the worse I just don't feel right about finishing it or posting it.
Shoulda boofed it and you wouldn't have had a bad trip