Jen, I can only say that i've urine retention of `19%. Stricture was ruled out by having flexible cystoscopy. Was diagnose having narrow bladder neck.
My prostate was slightly enlarge, the first line of drugs are the alpha blackers ( alfozosin) 10mg per day that acks on the smooth muscles of which the bladder neck is made of. This medicationrelaxes this muscles there by allowing . This have given some relief. The doc says I should try using this medication at least for 6 months.

Hope this info helps you.
Cheers

I see this was posted a while ago but I just wanted to ask if you found anything to treat this? I have an odd problem where I will get spasms out of nowhere in the muscles used to "hold in" pee. After this happens I have urine retention and sometimes can't even feel that I have to go to the bathroom.

Hi, my husband has had this problem for over 15years. It can be a very serious problem if not managed..He has been taking 5-10mg of hytrin for
the past 15years with minimal relief...What we've discovered over the
years is the following....Yes constipation and hemorroids can effect the
bladder......(he has frequent problems with both) and what we've just
discovered this past year is......From not emptying the bladder - the
bladder ( a stretchy muscular organ, which can stretch greatly in size) can
also blow out pouches called diverticuli.. Caused from years of not
empyting out completely...My husband has 2 diverticuli found with ct scan
one the size of a grapefruit that according to his urologist has been forming for years...The treatment is surgery,, to remove them and fix the problem which will be cutting the bladder spinter.. His surgery is scheduled for the 13th of feb....So please see a urologist and get treated..
Good luck.....

I also have had problems emptying. It was discovered an enlarged prostate was the main reason. Go to an urologist and have an ultrasound bladder scan done. It is easy and painless.