That is what happens to me unjollyrodger. My common sense says it is nothing.....my panicky mind says it's heart attack - go to ER. I am so embarassed by all the ER visits that the last time I went - I literally told them I feel like an a-hole. They were very kind and comforting - said it is better to be safe than sorry. They actually had 2 ER doctors working with me to figure out what the issue is. When I was getting ready to leave - the one ER dr. said you aren't crazy......and I said to the other one - what is going to happen is I really will be having a heart attack or stroke and probably end up dying at home because I will think I am just having anxiety. He told me no, if you do not feel like something is right and you feel uncomfortable with whatever is going on with your body - come back. He said it is not a problem. At least they didn't treat me as a head case and rush me out of there. They took time and talked to me and they really tried to figure out what was going on.