Hi I was put on xarelto for numerous pulmonary embolisms. I have been to the er twice because of shortness of breath. Both times after numerous tests I was told that it may take up to a year for the blood clots in my lungs to dissolve. How do I know if something is really wrong? All of the time I feel this shortness of breath. I was told that I m probably not going to feel all that well until the clots are gone.