I have had very severe tinnitus for approx. 30 years.  I know beyond a shadow of a doubt that the effects of the tinnitus has caused 
serious problems in relationships as well as problems at work.  As a computer programmer I was sitting at a desk in front of a keyboard for 
very long periods of time, very often with nothing to do, nothing to concentrate on.  When you're hearing a fire truck siren going full blast in your head it cannot help but cause one to often become short-tempered and irritated.  It has also caused problems sleeping.  Often I have had to read or have some means of concentrating on something besides the noise until I got to the point of falling asleep out of sheer exhaustion. 
I started taking Lyrica for diabetic neuropathy about 3 years ago and, looking back, the tinnitus was not bad, still a light ringing, but someone shut down the fire truck!  It was tolerable to the point that I was sleeping well.  A couple of months ago I stopped taking the Lyrica because of the high cost, did not take it for about 6 weeks.  The tinnitus came back with a vengeance.  The neuropathy returned, also with a strong vengeance.  Last week I had my Lyrica prescription refilled, when I got it I took a double-dose (NOT recommended!) and after that initial high dose I have been taking the prescribed dosage and the neuropathy has almost disappeared and so has the tinnitus.  
I am thinking after another week of regular Lyrica doseage I will stop taking it for awhile in order to see if the tinnitus returns.  I KNOW the neuropathy will return, but for the purpose of seeing if I can correlate the Lyrica with the tinnitus I can bear it for a week or two.
I'll check back in after I do this (totally NOT scientific) test and see if I can make the correlation.