I have moderate hearing loss, and have been on Citalopram for about 8 years. I have never noticed any effect on my hearing. It might be that due to the depression your anxiety levels are sky high and you're brain is making unnecessary links about the two events. It usually takes depression tablets 3/4 days to completely get into your system and the another 4/5 weeks for the system to settle down with the medication.
Lots of issues with Citalopram including an INCREASE in depression. It needs new research, it is dispensed far too widely at present.