Panic Attacks

Amanda
Okay so I know this sounds really weird...but I notice that I often get what feels like a panic attack while sex with my boyfriend. I am not nervous around him we are very close, I love him very much, and we have a very open and amazing relationship and I'm not worried about our physical relationship...it's great, but right before reaching orgasm I feel very   Panicked and begin crying uncontrollably. It feels like a switch is flipped and I need to stop right that second.  Sex is supposed to be wonderful and beautiful, but if I always feel like this after it takes away from the moment. The more intense the sex is the worse I feel. Is this completly weird???? Does anyone else ever experience this?