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.
MWRobb
And I was eating a lot of take-out both times, since I was too tired to cook healthy meals.
My guess is that it had something to do with my resting heart rate being so elevated. Maybe I was burning more calories just sitting there?