first time something weird with ssri change

I woke up this morning, and for the first time, there may be something that I experienced that may be from leaving lexapro and starting citalopram.  I had this momentary audio buzzing in my right ear.  It lasted about half a second, but was very disturbing.  Sounded just like a stereo trying to be tuned in.  Other than this, I am still very good with the change one week out.