I'm glad to see that you will consider seeing a medical professional to get your upper body checked out: the last thing you want is to potentially learn that the pain may end up causing further damage to your body, no matter how "delicate" you feel your body might be. A professionally trained massage therapist 1) asks you for your desired kneading pressure and technique at beginning of the session, and 2) checks in with you at least couple or more times during the session to see how the pressure and overall massage is feeling on you and your body: I get the sense that he didn't do either with you.
Also don't forget that you should not hesitate to tell a masseur that the pressure is way too much or if anything else is bothering you. They will stop to listen to you and address it before proceeding with rest of the session.
In case you were not aware of his massagefinder profile, he mentions that he works full time in construction. I am pretty sure he offers an extreme deep tissue kneading to his clients thinking that every one of them would want & need the type of deep pressure kneading that someone like him working full time in construction industry would. Without a proper training and certification from a massage school/institute, he has no business charging the rate he does.