80 feet and persists after surfacing? Doesn't sound anything like narcosis. Same for hypercapnea, doesn't sound like typical symptoms or consistent with the persistence.
Far more likely to be decompression stress, assuming no other underlying medical condition. We think of getting bent as a binary thing - you either need a chamber ride or you are fine. But everyone bubbles on ascent, and if you do a number of dives in a short time, for multiple days, the effect is additive. Fatigue, flu-like symptoms, foggy thinking, etc... all are seen with decompression stress.
Far more likely to be decompression stress, assuming no other underlying medical condition. We think of getting bent as a binary thing - you either need a chamber ride or you are fine. But everyone bubbles on ascent, and if you do a number of dives in a short time, for multiple days, the effect is additive. Fatigue, flu-like symptoms, foggy thinking, etc... all are seen with decompression stress.