How To Treat Fluttering Feeling In Left Breast?

I quite often have a fluttering feeling in or above the inside of my left breast. Sometimes it is painful, sometimes not at all. Sometimes when it happens I feel like I get a lump in my throat and that my breathing becomes shorter and faster. This usually happens quickly and goes away quickly, but can happen several times a day or sometimes several times an hour. It happens most frequently about 10 minutes afer I eat. I have been told it is just anxiety, but I am not anxious when it occurs and have no other anxiety/panic related symptoms or issues.