Stop worrying!
Remember that IBS messes with your insides, it alters the timing of your digestion, nothing is running in synch. Your bowels are probably blocked up, would it make sense to begin eating normally again?
I have exactly what you refer too. After an attack, ive been ill & resting for 12-18 hours; my body tells me that it must surely need some food by now, and I am hungry... but if I do, I ve come to expect discomfort while my stomach digests it.
Its a catch-22, you have to eat at some point, but youre tummy is in the wars. I usually eat small meals (avoid over eating if possible), and avoid IBS triggers too... For instance I learnt that banana was bad for me on an empty stomach (but not as noticable normally..)