I can empathize with the problem of bedwetting. I myself was a bedwetter. I don't want to dash your hopes, but I wet the bed until I was 15. My mom took me to numerous doctors who had me wear a sensor in my underwear, and also had me not drink liquids after a given time. Nothing they tried worked. The doctors said I would just have to outgrow it. I eventually did. It was tough for a while, but my friends understood - when I was at sleepovers and I had to put a rubber sheet inside my sleeping bag.
I was also a VERY deep sleeper. I know that my dad wet his bed until he was 14 or so also, so it might be a hereditary thing. All I can say is that it will end sometime. You can try reassuring your son that he's not the only one like this and that it's just something that happens, no fault of his.
Another side note. My mom never tried waking me up in the middle of the night. If I wet my bed, then I wet my bed. If you're waking him up and he's still wetting maybe it's better to just let him get a good nights sleep.
I hope this has helped you in some way. Good luck and keep your chin up. He will grow out of it and he'll be a more compassionate young man for having experienced this.
~~~K. :)