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.
Honestly, you're only a month out. I was worse at one month than I was at diagnosis (less SOB, more pain, more exhaustion) and it took a long time to bounce back. I'm about your age (35 at diagnosis) and work a job where I am on my feet all day. I was really surprised at how long it took me to feel normal again.
Take it easy on yourself. Healing from these things takes time! Best wishes!