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.
I never did get the aches and pains you mention, but I could see how that could happen if your body is having to work overtime to get enough air and cool down.
My mom suggested that, since the body expels warm breath to help get rid of excess heat, it might just be doubly hard to get comfortable in hot weather if your lungs aren't working properly.
The good news is that it seems to improve over time!