Does anyone else get these? Sometimes out of the blue I'll think of something* and feel a massive surge of adrenaline followed by really high anxiety. I then totally focus on that thought and over think it to the worst possible scenario thus feeding the anxiety further. Sometimes, I manage to dismiss the thought but other times it totally envelopes me and it can take me a few hours to settle down again.

Anyone know what causes this? How to stop it happening? or how best to deal with it when it does happen?

(*normally a minor thing like did I pay a certain bill or what if I get stuck in traffic on the way home etc)