Stoo
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Reading through these posts, I don't believe anyone has mentioned the single largest physiological reason for the "panicy" feeling you might be having. 40', is not "deep" by anyone's standards, and narcosis simply won't be a factor unless you are a physiological annomoly.
Over the years, I've seen my share of "near-panic" situations or students that are simply feeling "off"...
Something you should look at is your equipment and how it feels. Poor air exchange, and the ensuing build-up of CO2 can be caused by any number of things... a wetsuit that is too tight; a poorly-tuned regulator; a tank valve which isn't fully opened. Even a mask that isn't sitting comfortably and is leaky or fogging can cause stress and poof gas exchange. Pay special attention to your hood if you are wearing one, and how tight it is around your neck and jaw.
So consider that, and when you are diving next, make sure you are breathing naturally and deeply.
And has man others have said, get out and dive with more experienced divers, but make them aware of your not-so-good dive...
Good luck!
Over the years, I've seen my share of "near-panic" situations or students that are simply feeling "off"...
Something you should look at is your equipment and how it feels. Poor air exchange, and the ensuing build-up of CO2 can be caused by any number of things... a wetsuit that is too tight; a poorly-tuned regulator; a tank valve which isn't fully opened. Even a mask that isn't sitting comfortably and is leaky or fogging can cause stress and poof gas exchange. Pay special attention to your hood if you are wearing one, and how tight it is around your neck and jaw.
So consider that, and when you are diving next, make sure you are breathing naturally and deeply.
And has man others have said, get out and dive with more experienced divers, but make them aware of your not-so-good dive...
Good luck!