I also go through because I tense up all the time and it gets to hurting so much in my chest wall. The doc said I had "costochondritis" which is and inflammation/arthritis of the chest wall from an old car wreck and other injuries where I broke almost all my ribs and sternum in three places which collapsed my right lung. It is not life threatening but very annoying to say the least :) You can type this into the HW search and find out more great info.
Also to learn to relax, please check out our Anxiety-Panic Resources thread at the top of our forum page, and when you scroll down to the post by "wen" you will find several links that are so helpful to many on here, plus a link to MoodGYM, which is a wonderful free online CBT course to help you deal with your anxiety :)
Good luck and please go see your doc to get further tests to ease your mind if you are not convinced :)
Much Love, Hugs, Peace & Comfort . . . Your Bro . . . Sam :)
~Co-Moderator Anxiety & Panic Forum~
"It is not the mountain we conquer. . . But ourselves."
Not a professional. Seek your physician's advice before making changes to your meds or lifestyle.