Sound Suddenly Getting Louder in Response to Other Sounds

I've had a low hum in my right ear since the end of December. Now all of a sudden, the sound is getting louder every time the fridge comes on (or the washing machine is running, etc.) Any ideas on what would make a sound suddenly, after 4 months, get louder in response to certain other sounds I'm hearing?

 

Can it be reactive tinnitus? I also have this. My tinnitus reacts to sudden sounda like phone ringing but it calms down in 5-10 seconds. I have my T for 4 months now and this happens for 2 months now.

 

My low piched hum gets louder while exposed to sound and so does the ringing. When the sound is at a certain volume the T is masked or stopped

 

I have this too, it sucks.