The OP has stated that they've ran scans and tests and determined nerve damage as a result of the spinal injury he sustained. Believe me, incontinence is horrible to deal with, I have it too, only the doctors and urologists can't determine the cause. They seem to bat it away like I was crazy. I have to use 3 pads when I say pads they're the same as the OP because of the volume of urine loss involuntary, they are adult sized nappies. At night if I forget to wear them or change, it leads to leakage in bed. I can relate to it being difficult to cope at uni, I start in September of this year studying Computer Science. I was allocated a single room, no en-suite because I was too embarrassed to put anything in the disability section on the accommodation application form. I finally come clean about it by sending evidence in form of doctors' letters and referral letters, they were really great about it and reallocated me a single en-suite room. I'm sitting here 4 weeks before going to uni about what sort of experience I'm going to have, I like to go out and drink and have a good night out, but it bites me on the butt in the form of a soaked pad in the morning and even sometimes it leaks from the volume. I sympathise and empathise on how you feel about it. I have heard about Sacral Neuromodulation helping in sending signals through the sacral nerves, but whether that is possible with your nerve damage is another question.
I have been to some very questionable doctors with varying theories, one tried telling me it was anxiety and I got put on Haloperidol for psychosis and I was very angry about this. My neurologist was shocked when I said I was on Haloperidol, he mentioned it was for psychotic conditions not anxiety and I thought "Ugh great". After an examination and strength tests he sent me away promising an MRI of the spine and head which came swiftly on, came back normal. By now I was dejected, still using pads with no answers, I went to my local "urologist" and I used inverted commas because he doesn't specialise in the waterworks and specialises instead in stones and he sent us away to another hospital to do urodynamics which showed no signal from the muscle to contract therefore when they loosened the catheter, the saline ran out and had to be caught, my cheeks burned red at this, the nurses comforted me as best they could as they cleaned me up. Fast forward five weeks I was told that I wasn't emptying that good and it could lead to kidney failure which scared me a little, I asked for a second opinion privately which he obliged. I saw the next doctor who read the notes and basically verbally crossed them out to me, he examined me and said he needed some more tests which came negative and now waiting for my next appointment in September three days before I go to uni to do something about it. I sit here right now covered up from the rest of my family to hide this ailment while typing this, have comfort in knowing you aren't alone.