Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. The given symptoms are not of panic attack. They are just due to your fear about something might happen. Don t confuse panic, panic attack and fear. Fear are present. The cold air made you nauseous, and that nausea kept you thinking and worrying. When that happened again, the thought (negative thought) made you worry about the nausea and your mind explained it as hyperventilation and the trouble begun. Fear towards something may go wrong, made you panic. This panic situation is not panic attack related to anxiety. Take it cool. Take some deep breaths and go for a long walk and you should be alright. Engage in activities. Don t think about that incident again and again. You may need psychotherapy treatment if the condition did not improve. Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe some psychotherapy techniques which should help you cure your condition. Hope this answers your query. Available for further clarifications. Good luck.