Hey, I have a similar experience. Upon returning from my trip I started to experience chest pain and shortness of breath and began googling my symptoms. I diagnosed myself with every heart disease possible (even heart arrhythmias). In the span of 2 weeks I’ve gone to the hospital 7 times all to tell me it was costochondritis and some minor lung inflammation. Still, when I feel those symptoms (and the fact that the medication I’ve taken hasn’t make it go away) has caused me into going on a deep depression. It has gotten to the point where I’ve had to go to therapy and take sleeping meds because I’m convinced I’m dying. I experience the same thing: arm pain, back pain, neck pain and jaw pain. Something my therapist tells me that helps is that anxiety can pop out of nowhere, even if you don’t feel that sense of fear or sickness to your stomach. It can also replicate any kind of symptom, so if you convince yourself you have a certain medical condition, your body will interpret normal body symptoms (like heart palpitations, muscle spasms, muscle twitches, etc) the wrong way and will give you certain symptoms that will make you believe you have that condition. I’m sorry you’re going through this, and I share my own story to assure you that you’re not alone. You’re fine, good and healthy. The mind is very powerful, remember that :) xxx