Yeah, that's right.
I've often found sounds to appear nasal or like I'm underwater... if I take a shower and forget to dry out my ears.
I use a dry & store (what I have is called Super Dri-Aid) for my digital hearing aid. When I start to sweat heavily, I take off my hearing aid to prevent damage and excess moisture. If things start to sound nasal, I will check the tube. If it's dry, then I know it's the inside of my ear. (This often happens when I take a shower and forget to dry my ears.) If the tube is moist, I'll blow it out. I'll double check my ears in case they're moist too. This always does the trick for me.
The only time this doesn't is when it's during cold season and my head is a bit congested, but this has only happened once or twice. It also happens on an airplane due to the air pressure in the cabin. So, I simply pop my ears. 
