Hi K.K. and welcome! Yes, when we panic, we tend to over-breathe, taking in too much O2. When the body is over-oxygenated, the carbon dioxide levels, even our blood PH changes, leading to further symptoms and creating more anxiety.
When our blood becomes too alkaline (in response to too much O2 and not enough Co2) we can experience...dizzyness, more shortness of breath, tingling around mouth and extremities, vision disturbances...to name a few symptoms.
Breathing into a paper bag 'recycles' the carbon dioxide that we have expelled and limits the amount of fresh oxygen that we can take in. Deep breathing exercises can be practiced and learned to the same effect. The obvious advantage being not having to hunt down a bag, and not being observed as having an attack!
Check out our second post at the top of the forum in Anxiety Resources. There are links to many good exercises and ideas on how to get started treating this:) As G.B. also wisely advised you, go to your doctor and consult regarding a therapy referral. (or possibly medication)
Please post anytime with us. I'm sure you will find this is a great place for information, caring and support:)
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"
"It is when we are most lost that we sometimes find our truest friends"
Panic Syndrome recovery due to CBT