The pins and needles sensation, at least for me, is part of relaxation, and not SP. I find that I can still move fine even after the sensations intensify and then pass. The sensation of irregular breathing could also possibly be imagined. Maybe, you could have someone watch your chest while you attempt to repeat what you did. Everything you experience already happens naturally, but you just aren't usually aware of it; keep that in mind. If you don't worry about it or expect it in the future, it should go away.