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.
Have you been working with your docto try to manage the pain? Sucks to feel like your body is betraying you.
For me personally, I don't assume pain or anything like that is purely medication related unless it's obvious the side effects stop completely when I stop the medication. If stopping medication is not an option, then I'd first check to see if something else is going on in my body that would cause it and if not, then deduce it's medication related.
I'm not saying there aren't possible side effects, AT ALL. I know the whole side effect thing is a sensitive issue. I do believe some people experience adverse side effects from warfarin (or any kind of drug really). I'm just saying don't dismiss something as a side effect before making sure it's not related to something else.
In any case, whatever the reason, I'm happy to hear you're feeling better!