Hi @kevkat73, when unexpected pain just arises out of nowhere it can definitely be a cause for concern. I do know that Afib can sometimes demonstrate pain or discomfort in the chest, throat, arms, jaw or between the shoulder blades.
You stated that it started a few days ago, have you noticed any triggers when the pain arises? Have you just eaten a meal? Did you physically exert yourself? Is it brought on with stressful situations?