Wow, interesting stuff!
As a psychologist it is interesting to see how you guys perceive these experiences, and your methods of dealing with these panic attacks. The only concern I would have is if you started to experience these symptoms while you were not stoned (or if you noticed that you were worrying excessively about issues that were not a concern before). However, If you are not overly concerned about these experiences (and can accept that "it is all in your head") then I don't think it is a problem.
cheers,
Matt