Don't know about the trachea, but pushing equalization while diving FRC can get you into squeeze type problems.
I do a lot of negatives and some FRC diving. Equalization issues are very similar and I have hurt myself twice doing negatives. Recovery took a long time. Strong urge to cough, never saw any color in my saliva, but lungs felt like a bad cough or a deep chest cold for quite a while, several months the first time, several weeks the second. I've learned what it feels like before a problem develops and stop now before any damage is done. The depth I run into problems equalizing definately varies from day to day.
Like Sebastion said, listening to your body and learning to stop early is the best prevention.
Connor.
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