Now the medications are interesting.
Fentanyl is an analgesic. Its a synthetic opioid and is very useful in both acute and chronic pain. It should most certainly have been declared to his supervisors that he was prescribed it.
Midazolam is interesting too. Its quite strong, even in mild doses, and in combination with fentanyl would be quite disabling, although 45 hours is well beyond the half life of the drugs, even combined.
I'm presuming the "stress test" relates to a cardiac test? Its a wonder he didnt fall asleep on the treadmill.