You shouldn't have any problem from stopping the Paxil after only 2 weeks on it, and I don't see anything in the literature that has auditory hallucinations as a side effect, nor have I heard any of my patients complain of that side effect from Paxil.
But let me make sure I have the timeline straight:
You were on 50mg of the antihistamine for many years
Two weeks ago, you began Paxil 20mg
For one week you upped that to 200mg/24 hours
2 days later (5 days ago) you started having auditory hallucinations.
3 days ago you stopped the Paxil
1.5 days ago you stopped the antihistamine.
It sounds to me like the problem was caused by the antihistamine. Hallucinations are a side effect
of dyphenhydramine as are the dilated pupils and drowsiness.
You should continue to have the symptoms continue to lessen as you get further away from your last dose.