I woke up with the tube in, and I wasn't too pleased about it. I felt normal and pretty awake (though exhausted, mostly because I'd only slept 3 hours the previous night -- long story, work-related!, but in reality the drugs were adding about a 7-second delay between what was happening and what I realized was happening. So one of the nurses kept telling me to stop biting the tube, and I had plenty of time to think "What the @#$% is he talking about, I'm not biting ANYTHING", then I'd notice "Chomp, Chomp!" as my brain registered me biting the tube! Fascinating experience, if you're easily fascinated by drug trips!
I (still) recommend that you and your closest pal who will be there when you wake up, practice (in advance =~ NOW) communicating wordlessly (on your part), via hand and foot signals. If you feel there's something you have to "say" while the tube is in, having practiced those "charades" may eliminate (some of) the panicky pressure.
Breathing DEEPLY is another matter entirely, as Larry and Al have indicated. Basically, during your OHS, your lungs are idle and probably in the surgeon's way, and they usually collapse completely. When you start breathing again (first with the tube, then without), your lungs are still impaired from that experience, partly collapsed and with some fluid in them. That's why you have to exercise them: inhale deeply, with and without the spirometer -- Johan and Al make it sound like BLOWING INTO the spirometer, but mine works by INHALING through it -- and try to cough, initially while clutching a pillow or something similar to your chest. My lung function was essentially 100% maybe 3 days post-op, even though I mostly only THOUGHT about using the spirometer
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Both breathing impairments are usually worse to hear about than to experience. And even if they really are unpleasant (as my breathing-tube experience was), it'll be over soon, and you'll be on to the next adventure. Recovering from a "valve job" is a multi-day series of exciting (and positive) adventures, most of them involving disconnecting one of the MANY gizmos you're hooked up to!