Our expert says:
Having had a kidney stone earlier this year ( mercifully not needing surgical removal or stent ) I can vouvh for it --- it is one of the most exquisitely painful experiences imaginable. And then some. Some of us do, surely, get quite surprisingly disturbed by such experiences, so this could applyy to him. It's hard to tell from a distance. So what i can say is YEs, it is very believable that this is causing the change in him, but not certain, and weither way, it suggests he could do with some counselling to help him to sort things out.
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