Am I hearing things (you don't) ????

About 5 years ago I started to notice a ringing in my ears. This is not a debilitating condition and I have learned
to tune it out. More disturbing however is an inability to tolerate high frequency "Noise". An example would be
the sound of plates clanging against each other as you remove them from the dishwasher. This type of sound
feels somewhat painful. At the RMAF last month after day one I found I could no longer listen to anything and enjoy it
as my ears felt fatigued. ( stayed too long at Raidho). I had a pair of ear plugs but failed to employ them at all times. Normally I listen at an average of 70 db. per my free phone app readings. 
I seem to notice during quiet moments a very low frequency off and on rumble sound. I thought it might be a piece of equipment in the home so I shut everything down, walked outside around all sides of the home thinking it might be emanating from a neighbor. No go. Its in my head. 
At age 60+ I have probably been subjected to my share of excessive noise but have never been an artillery man or Navy Gunner for example. 

Anyone else have similar experiences?