To me this sounds like a mild overdose. If someone ends up getting high for the day and then they begin to get to high, they start getting sick, in and out of sleep, slightly labored breathing, cold sweating, dizziness even bluish lips. You can always look at your pupils if you are wondering if the opiates are still having an effect. For the most part opiate WD is not going to look like in and out of sleep all day. The possibility of RC opiate pills is always there.
I have seen people with low tolerances get sick from 15 mg of oxy but if he has a tolerance it is a little weird. What would be crazy is if he was actually going into rapid WD from an extremely short acting opiate. Always check your pupils if you are wondering if your in full blown WD. They should be rather large. I never heard of anyone getting sick from the dye but it is possible. Who knows these days with all the fake pills.