I had the privilege of doing a few dives with and spending some time with Ahmed Gabr, privilege not because he holds the world record but because he is a genuinely wonderful human being. We spent quite a bit of time discussing his dive, specifically the planning and preparation. He spent a lot of time talking to Nuno about his dive, and changed some procedures to minimise some of the issues Nuno had.
Ahmed told me directly that he still hasn't recovered completely from the dive, it took Nuno years to get to a "normal" point after his. These were dives that went exactly to plan, mind. This was after over a year of working with dive physicians just on calibrating a deco algorithm to his physiology.
Ahmed also told me that in hindsight, he probably wouldn't have done it, knowing what he does now.