I think you need a different urologist. Your urologist should be the one treating you for your bladder issues. Retention can be a problem if you are holding back to much. Sometimes they will have you to self cath and messure the output to see how much you are retaining and if it's a large amount, then they may suggest you self cath all the time and or try some meds or other options. To much retention could back up into the kidney's and then there can be a real problem. My urologist has me get an ultra sound of my Kidney's, bladder and testiscles at least once a year to make sure all is good. My retention changes and he knows it's not feesable or easy for me to self cath since I have to wear diapers, so doing the ultra sound to keep check on things is very important to him.