Sounds like something I had when I was about your age. I'm tall and slim too.
I was diagnosed with "mild pluracy" (fluid in/on the lungs), but at the time, due to the general area of the pain, I was more concerned it was heart
related.
Q: are you a smoker?
what kind of environment do you work in?
I wouldn't get too worried about this, it will only concentrate your thoughts and focus on the pains!
I hope you feel better soon