There's a tension spot just above your left nipple, and a little
to its right, If you push into that area, you'll eventually find
it. It's tender, sore and painful.
Deep massaging it can help sometimes. I don't know what the name
of it is - there's a similar one deep inbetween your thumb and
index finger, in the muscle part.
I found a chart one time that went through them all. Nothing
hoeky about it; they seem to be well known 'cause I've seen them
in a few places but I don't know the names of them. I'll have to
find that chart sometime; it was part of a PDF I downloaded back
when I was at Schering.. so... 16 years ago?
Anyway, I'm sure it's around someplace. That can help relieve
some of the pain... although it hurts to massage it at first.