I was in a shop today and was fine until a person engaged me in conversation. I suddenly got a heavy feeling in my chest, went as white as a sheet and very light headed. The lady asked if I was ok but I had to get out. I came home, had a brew and felt a bit better. Later on I walked to the local shop where I know the owner and blow me down if it didn't happen again. I shot out of the shop, I couldn't get home fast enough. The shop owner rang me to see if I was ok, she said I looked awful, she said she could see the colour drain from my face. Do you think this was a pa or something else. It seems to happen if I have to stand for any length of time. Your comments would be very much appreciated.
Many thanks in advance