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I've never dealt with a CO2 overload so I don't know how I would deal with that other than just trying not to panic. Is there a particular method to deal with it?
Yes there is ... but what you do will depend on what's causing the CO2 overload. It's usually exertion or a poorly performing regulator.
If it's exertion, stop doing whatever it is that caused the exertion ... in my area that's usually current. If you have the option, duck behind a structure to remove yourself from the current. If you don't have that option, grab ahold of something and concentrate on relaxing your body. Then work on getting your breathing under control. The resolution's counter-intuitive. The CO2 built up in your body is screaming at you to take another breath, and instinctively you'll be breathing fast and furious ... like you just ran a race. But that's the wrong thing to do. You have to concentrate on forcing yourself to slow your breathing down ... deep and slow ... to give your lungs a chance to make a good gas exchange and get rid of the excessive CO2 in your body.
Stop ... relax ... breathe deep and slow ... within a few breaths you'll start to feel better.
If the CO2 problem is caused by a poorly performing regulator, it'll usually show up on a deeper dive. Your solution is to go shallower ... and don't go deep again until you get a reg that's appropriate for the depth you're trying to get to.
Thing is that if you experience this problem and don't know how to cope with it, you could find yourself in some seriously deep sneakers ... the feeling that you can't get enough air is a serious stressor, and those often lead to a level of stress where panic becomes the biggest concern. If panic sets in it won't matter what you know ... your brain won't be processing on a rational level anymore. The "get me the hell outta here" instinct will be in control, and you'll just be along for the ride. At that point, anything can happen.
... Bob (Grateful Diver)