I highly recommend faithfully following some anxiety relief regiment such as breathing exercises, long after the point that you've decided they won't help they actually do start helping. Another thing to remember is its long term, there's no overnight cure. Just sTay stronger than the anxiety.
I have, and have always had, random chest pains. It'***** actually what caused the majority of my anxiety to begin with, and have at least 5 er visits for them. And I swear, I know doctors will tell you chest pain is anxiety related, but they don't tell you how real and how painful it can be. All different kinds, the sharp pain in the sternum, dull pain over your heart or even on the opposite side, every different kind of pain anywhere in the chest you can imagine. Odds are it is the anxiety and it's just hard to accept that anxiety can cause that type of pain. During my first bad run with anxiety which lasted about a year, I actually had my left lung randomly collapse. Now that's panic lol.
It's all about sorting it out in your head and fighting it over and over. You rarely win, but eventually you wake up one day and realize it's been gone and you never even realized it. Just know that you're alright and stay strong.
I also deal with acid reflux.. but i dont feel like it is active enough to cause me difficulties breathing and occasional wheezing. I know how stupid this sounds but i swear the wheezing is only in my right lung, and that leads me to believe there is a problem.. i dont know how muxh longer i can handle this, it is so scary
I'd like to start off by letting you know that I currently suffer from the most extreme case of panic and anxiety I could ever imagine, and then some, and I also can't seem to shake it either. I believe this is due to a recent acid reflux diagnosis that causes me to feel like my throat is swelling, and I feel like if this wasn't an issue I would be able to shake it, but with my array or other mental health symptoms I can't be sure.
But I have beaten severe panic and anxiety before, under similar circumstances as yours, and I have about a million things that could help. If there's a way to message, you can do so and I'll be as thorough as possible to help you through it, but I'll give you some good tips as best I can on here.
#1 breathing. Through your stomach and not your chest. I promise you it sounds like it's not much, and it takes months of practice before results become noticeable, but trust me, look up the correct way to breathe, and I'd use keywords like anxiety. It will help, if not single handedly resolve your situation in the long run.
#2 as impossible and ridiculous as this sounds, sometimes you have to simply fight it. You have 2 things to your advantage: you have had the tests and you know you don't have cancer, and cancer is something that isn't an immediate threat to your safety, it's more of a long term thing. Using those 2 things should make a huge difference in finding a way to simply ignore the feelings ando fight it.
It's not easy by any means, and it takes a lot of practice, but with time you should be able to teach yourself methods of calming down during periods of intense anxiety/panic and use logic to fight the irrational fears. It's almost an art form, but there are ways to do it and with practice it gets easier until it eventually goes away.
Also i have quit smoking for a while now. And excersizing daily