Of course that entailed no brain damage or loss of hearing, but it was a very compelling sensation, and it caused massive panic (the first time at least, the second time... somewhat less so, but I do get the feeling that I had an emotional response that was in some sense 'synthetic' and due to the pharmacological reaction).
Hence, a subset of these symptoms might be pharmacological, but not all of them. That leaves open the question of motive.
(Yes, I understand that a partial explanation of symptoms and no explanation of motive makes for a totally bankrupt theory, but hey, I just thought I'd throw in my anecdote - and I'd really rather not explain the particular combination of medications.)