I've recently been diagnosed with COVID-19 and while the fever, diarrhea, and vomiting are gone, I'm really worried about some new symptoms. I'm dealing with severe chest pain, chest tightness, and breathing problems. Right now, I'm on mechanical oxygen support at home. My PT and D-Dimer plasma levels are pretty high, and there's a concern about pulmonary embolism. I've been having excessive sweating for the past two months, leg cramps, and some occasional swelling, which is concerning me even more. My chest X-ray came back clear, but I read that X-rays might not always catch a pulmonary embolism. Could you tell me what I should do next and what would the treatment be if it is a pulmonary embolism?