Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
If my allergies or sinuses are bothering me, like they are lately, I get an upset stomach and diarrhea from that on occasion. Sometimes it's from all the meds and the drainage. So I agree that if it continues or gets worse, mention it to your doc. Also, warfarin can cause GI upset. So it could be from that too.