Personally, I have also previously woken up at nights due to pain, and it has just returned in last couple of day....however....I really believe that some of this feeling hungry may well be down to habit and timings of wakings up etc.
Our bodies need to have undisturbed sleep to rejuvenate itself and to heal itself. Waking up at night with pain kick starts the cycle off in to the cycle of then going to the toilet, and then thinking self hungry....
I only say this from having had similar problems at night with pain, although I used to be only able to crawl out of bed at times with the pain!!!!
Since getting the right treatment for my pain and brain, I have at last broken the cycle's that I had set up for myself within my brain.
I am not a psychiatrist or anything HCP etc......I have been on a GP managed Stress Management Course that helped me recognise the cycles of how our brains get in to habits, needing unbroken sleep etc......
I am not going to suggest that it is because you are low carbing etc, etc, as I personally believe that if you go to bed without feeling hungry then you should not wake up during the night feeling hungry if your sleep pattern is a good one.....