There can be a lot of strange symptoms when you get very high on Opioids and are nodding in and out, but as a general thing, Opioids are not known to produce hallucinations of any kind as a primary symptom. As others have said, in a way, anything is possible if you get intoxicated enough and different people are inevitably going to experience and perceive the intoxication in different ways.
However, some Opioids are going to be more susceptible to producing hallucinations. I won't go through a list of them right now, but they are out there. The Opioids that you have used in this instance are not known to produce hallucinations.
If there are not objections, I was going to consider closing this one up. I feel it's a pretty clear-cut issue. Leaving it open for a bit in case anyone has any lingering questions.