You should see an audiologist. However, just to allay some of your concern, you may not actually have damage, you may just be sensitive and noticing difference that for the most part was already there. The wet boot thing is obviously something that's new, but the fact that you hear differently between the left and right is typical of everyone.

If I focus on it my L & R sound very different, but if I don't then everything is fine and sounds normal. It's like having a dominant eye, when you care about it and think about it the dominance is huge, when you don't focus on it you just go about your daily.