It might be worth doing a three day urine diary, there are plenty on the internet. You record fluid in and out. Based on your length of urinating it doesn't sound like your bladder is holding much. Average flow rate can be measured as follows. Urinate into a urine bottle and time how long it takes. Assuming the urine bottle has a measuring scale on it divide mls by seconds to get an average flow rate.
I and a few of us on here had problems with the migration of surgical clips from surgery.
Even passing soft gunge through the urethra can cause extreme pain around the perineum and genitals.
I found I could walk two or three miles without leaking but as soon as i stopped walking I leaked.
Hope you find a solution.
Thanks Chris