Sometimes everything sounds terrible to my ears. Lacking of high end or ear piercing (or both a same time). After few days after stopping practicing everything goes back to normal. Does my hearing fatigue or it is something wrong with my ears?
Wow, this is a big subject - & one I'm not fully qualified to answer, but I'm going to try anyway...
Hearing fatigue is a very real phenomenon, though it takes many forms, of which I shall just skirt the main aspects...
You get bored.
Your brain, rather than your ears, stops hearing anything other than what you are concentrating on.
This is a "mix killer" & a sign you ought to quit for the day & come back tomorrow... it's also one of the hardest to self-identify
Actual 'volume fatigue'
This is a 'compression' of the mix that occurs if you have been listening too long at too high volume
...again, the 'fix' is to come back tomorrow.
You need to blow your nose.
The worst - once you do, your entire day's work is suddenly invalidated. Everything sounds wrong
Fix, again, is 'come back tomorrow'
'Check it in the car' syndrome
If you cannot make a portable mix; one that sounds good everywhere - car, iTunes, walkman [if anyone still has one], friend's stereo...
then you may need to re-evaluate your studio listening environment - test for resonance in your mix room. Also poor monitoring or headphones [Aaaarrrgh, you cannot mix on headphones] may be responsible for the discrepancy.
There are others, I hope someone else will fill my gaps...
In short: you can, yes. Just like with any kind of information, you might be experiencing some sort of fatigue. From what you describe, though, it may be that you have some sort of lesion, and the inflamation gets worse when you are exposed to certain sounds for an extended period of time. Solutions might be a) take breaks often, 2) go see a doctor, make sure they examine your tympanus, 3) low your decibels :-)