After seeing your numbers, I'm now very worried that DCS could be the problem.
From my experience, your profiles on each day (individually) show signs of significant nitrogen retention, although on a one-day basis I would not expect any of those profiles to produce DCS, unless you are 'highly susceptible' to DCS or have PFO.
However, on a MULTI-DAY basis, it is highly possible that you were not 'blowing off' the nitrogen from each day. This also means that it even on 'bad profile' days, you wouldn't necessarily notice DCS symptoms, because you were still in the 'accumulation' phase.
Then, on that last 40m+ dive, the N2 was too much and symptoms hit.
The single most important indicator is that you felt bad suddenly after that dive. Most other problems (sea sickness, dehydration, CO2 headache, etc..) build up gradually.
Eric Fattah
BC, Canada
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