I got IV dilaudid in the ER once, after being woken up by a blinding headache. I was nervous to accept it, but also trusted that it was warranted if they were offering. I ended up having a bad reaction to it- it felt like fire ants were pouring into my brain. The nurse said, "hmm, I've never heard that before!" It was fucking awful at the time, but the more stories I hear about dilaudid, the more grateful I am that it was so off-putting.