pessary short vaginal passage

[Maisiemugwump]

looking for advise. I had a bladder prolapse op 8 years ago failed in less than a year. Prior to that had tried ring/ doughnut pessary but was told as I had a short vaginal passage they kept coming out. Prolapse has now come down quite significantly following a cough (I think). Not quite protruding but nearly want to try a pessary again. Has anyone been told they have a short passage if so what worked.