Trigger Point Injections- scared

Body: 

hi,
i am going into the doctor tomorrow to get trigger point injections into my pelvic floor muscle that has been suffereing from chronic tension for about 9 months. i would like someone's opinion if you have experience with this. i am certain that the muscle tension is my fault- holding things tight after the prolapse was my body's response. now after months of manual therapy with my PT, i cannot get the muscle to relax on my own. it is now time to use trigger point injections. my only fear is that if my muscles finally do relax with the injection, is my prolapse going to sag further? i welcome any thoughts on this issue. my appt. is soon.