Were you well hydrated on the last day and nourished?
We had a fellow come up for a day of diving, and after 1.5 hours in the water and dives no deeper than 8m, he got extremely sick, very similar to what you describe, and eventually vomitted. After that, lots of water, and some food, he was fine.
He had not drank much water that day and had eaten only a muffin or two. We strongly suspected that was the problem.
Not to say that I would rule out DCS, just another thing to look for.
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