I do think you're over reacting a little but you're feeling pretty crappy so it's hard to put it in perspective.
That you work there really isn't relevant, it doesn't enhance your credibility or entitle you to special treatment.
Part of the routine orders in a lot of ERs, people lie, it's a simple, quick test that covers them from liability.
I'd take that as the doc thinking out loud, allergies to morphine and hydrocodone pretty much eliminates 2 of the opiate "families" due to cross sensitivity. Would be nice if he'd asked what you have taken in the past without problems.
Sounds like the follow up instructions were included in the dc instructions. Ideally, yes, the doc should have been the one to tell you but they got busy. Would you have been happier to wait, possibly several hours for him to have time to come tell you the exact same thing the nurse did? The nurse indicated that it was no big deal, perhaps that information came from the radiologist.
If they had filled up in the time you were there, most likely his thoughts were on dealing with an ER full of people who hadn't yet been seen or treated. My experience is that it's just not that unusual for nurses to include the fact a test was abnormal and needs to be followed up on as part of the discharge.
I'm sorry that you didn't get any answers, I hope it does turn out to be nothing.
I also hope you don't wind up having to pay for the second CT scan, from an insurance perspective the second scan should have been done as a (most likely pre-authorized) out patient procedure.
I sincerely hope you're feeling better soon.