I Was Diagnosed Wit A Pulmanary Embolism A Mo Th

I was diagnosed wit a Pulmanary Embolism a mo th ago and have been put on Pradaxa for three months. Everytime I take the Pradaxa or eat anything my left side over my breat hurt me so bad and radiates to the back of my breastbone. I have been to the doctors and to the ER so much until Im told to not come back because its not my heart. This pain is driving me crazy. Can you possibly tell what you think this might be?