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.
Regarding your oxygen stats and trouble breathing, I would probably continue talking to your doctor about that, especially if you're using an inhaler frequently they may be able to give you something additional to help keep your breathing under better control.
Wish you well in everything.
I hope it all goes well for you and that you get feeling better shortly.
Lydia