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I can't help you from a personal point of view, but I've read a fair few stories over the years.
It seems to me that the most likely cause of your problem is a stricture or adhesion - the growth of scar tissue - which is stopping your bladder draining completely.
If that is the case, it should be relatively easy to fix in most cases, but what you need to do as step one is to kick your urologist to the kerb and find someone who is more interested in you than his fee.
If you go back to the website and locate the Search Engine there and key in the word stricture, you will find many references and some discussions on the subject, all of which might be helful for you.