I know the feeling. But you need to tell yourself "i just went to the doctor and everything checked out perfect!" If it is still bugging you after awhile then have your doctor check it out just to ease your mind
I'm the same way always think I'm dying or something is seriously wrong. It's just your mind playing tricks on you bc if u keep thinking something is real you'll actually have that pain cuz you'll trick yourself idk how to help cuz I deal wit it to just try not to think bout it n tell myself it's not real good luck hun
I'll also add I just went to my Naturalist doctor (only doctor i have) not even a month ago and none of the scans showed any cancerous cells or abnormalities. I'm so scared about this, I am convinced it's cancer.