On the slight chance that you all would answer questions here one day, here's one I'm curious about.

When your eustachian tubes get clogged, or sounds around you just generally block out everything you sing, either via allergies or a cold, or just by sheer volume of the music, how do you continue to make sure you're hitting notes exactly on pitch? Especially the higher notes. (aside from million dollar headphones lol) I only have one ear that works and when it constricts, I can't hear myself sing in the higher notes to make sure I'm on pitch lol. Tips are appreciated and if you charge for this information, I understand lol.