oops

I've been nursing for how long, now?  Four and a half years, total.  Monday, I had a very painful lump/spot under my arm.  It hurt enough that I was sure it was a lymph node and I was trying to hold my arm away form my body because it was painful.  Today, I finally went to the doctor, only to find out that it is almost certainly a plugged duct way high up.  It's funny because I know what plugged ducts are and I've had one before but because this pain was practically in my armpit, it never even occurred to me that is could be breastfeeding-related.