Just wanted to tell you that you are not alone. You got great responses on here, as well. I had this happen a few months ago in front of my bf and my son. It was like I was out of control of myself and it totally freaked me out.
In the past, counseling helped me more with this than my program, though, because it was a very deep pain hidden in my subconscious. Not sure if that is an option for you but I do know that I haven't had it happen all that often either. If it were to become a frequent thing I would be concerned and definitely address it with counseling/therapy to get to the root of it and fend off further attacks. Hugs to you, I know how disconcerting this can be!