You might have seen my response in the other post you replied to, but I'll tackle this post too. I, too, have dealt with terrible chest pain for almost two years. The general consensus is tightness and a lack of flexibility, along with my desk job, are wreaking havoc on my body. Costochondritis has been brought up as a possibility as well. But it sure doesn't feel that way. It feels like I'm dying, every second of the day, every day of the week. There are many on this board that express this better than I can, but the real challenge is for you to accept the diagnosis. Just because you have a symptom doesn't mean you've got health anxiety. It's when you have the symptom, and get checked out, and again, and again, and again....always believing that THIS time you'll get the right answer. THIS time will reveal the real story, when in reality, the real diagnosis was there to begin with. This is what I keep trying to tell myself too, so don't think I'm speaking down to you. I'm right in the middle of it myself. Even as I type this, I'm getting crushing chest pain, shortness of breath, radiating arm pain...the works. But it's been happening for so long that I'm learning how to cope with the urge to run to the ER.
Also, Dr. Google pretends to be your friend, but he's not. There's no substitute for an actual medical exam by trained doctors. Very rarely does Dr. Google help any of us. This may be the toughest thing to do, but you need to trust your diagnosis and step away from online researching. There's no lasting peace that comes from that, only new things to worry about.