obstructions suck. and yeah if you were obstructed for long enough it would hurt like heck for some period of time afterwards as your intestines/belly tries to absorb the beating it took during the blockage. the cured meat nature of corned beef hash might have been too taxing. I would think that as long as you feel sore, you might want to stick to as close to a liquid diet as you can. as the pain eases, then you might add more gentle foods as tolerated.
importantly though you need to think about how to deal with or preclude in the future. did you eat anything in particular, maybe something heavily fibrous that might have been the trigger. doesn't always have to be, I obstructed once because I inhaled an bagel egg breakfast sando, so speed of eating, and or lack of chewing can also be a culprit.
also if your obstructed for too long you risk intestinal perforation and all the nastiness that comes with, ie sepsis and risk of death, so please be mindful of that if it were to happen again to not necessarily hold out too long before seeking medical treatment. I am sure that even the docs at military post can treat a blockage. the jpouch would just be a new wrinkle.
my pattern of behavior changed after the first few blockages that ultimately took me to ER. I began to realize that as the bloat increased and I began to vomit it was time to go as the pain was only going to escalate. ironically a couple of times the vomiting actually helped release the blockage but for the most part it was an escalation in severity and a warning sign that more pain was to come and that if I didn't head into the ER soon enough for pain relief that I might very well choose to die, yes it hurt that much. and for all the bargaining I did with every known deity it was for naught. ;-)