Roark had job options working for other architects; the quarry was not the only work he could find. This was explicit in the book. I don't recall anything about Roark finding the quarry upsetting (i.e. it causing him suffering). If he was suffering -- which I think he wasn't, he was too strong -- it was because of the world in general, and the badness of the architects and clients he'd left behind, not due to the quarry which was nothing compared to them.

Do you think the people in Galt's Gulch suffered in their education? As I recall, they did things like voluntarily attend Galt's lectures (and pay for it, I think). No suffering in sight...