Hi Michelle, this happens to me a few times a day. Its really scary at the time, & sometimes lasts for quite a while for no known reason. I put it down to anxiety because after a load of tests, some repeated, there is nothing physically wrong with me, although it doesn't feel like it when this happens. Try not to stop what you're doing. I find that the more I busy myself or try & think of something positive, then the sooner it goes away. If you are worried about it, go see your doctor for some advice & share the problem.

You'll get lots of replies & reassurance, & realise that its more common than you think.

Les