Hi, Rose76. I've been told the same thing as Bjornen, quite often; that it's stress related. And so most people have suggested that the way to cope with it is breathing exercises or yoga. Sitting up straight and focusing on your breathing. I can't remember how this helps but I think it may be because you're distracting yourself from the chest pain and putting your attention towards breathing. I agree that the emotional response to the pain/discomfort can make it a lot worse so it's best to keep yourself calm.
There are medications which work with your arteries but I think this may be related to heart trouble rather than anxious chest pain but I'm not sure. If you're worried about this, please consider a check up.
Sometimes, overthinking brings on stress or anxiety which causes some irritation/discomfort for me.
I hope it all works out okay and isn't anything to worry about