I have the same pain under my left arm pit it comes and goes and I just saw my doctor about it and he is sending me for an ultra sound he felt around and felt nothing and is checking my blood CBC I'm very worried now. I'm scared they will find something can anyone help me? My anxiety has been through the roof lately. I'm sitting outside the doctors office in my car in the rain booked the appointment and got in within 2 days which also scares me. When I saw my doctor I wanted to really talk to him about my health anxieties. I always chicken out though. Can anyone help me, Please!!