Hi last week I had a lot of pain in my chest and under my arm and back. I have a large swelling under my armpit and 2 nights ago I couldn't sleep because of the amount of pain I had. I have told my BCN who said she was not too worry bout the pain but was concerned about the swelling and I have an appointment at the hospital for the 22nd. Has anyone else experienced this. It was 9 months ago now since I had my mastectomy.