<s>[INST] I went to an urgent care center yesterday for cough and shortness of breath. I have a history of asthma. In the process of being worked up they ordered a d dimer test which turned out to be positive. They then sent me to have a CT of chest. They said that the CT was negative for a PE but that my lymph nodes in my chest were enlarged. He suggested that I wait 3 months and have a repeat CT of the chest. He put me on a zpack just in case of infection even though I don t feel sick. I attributed my symptoms to breathing all the smoke from 4th of July with the fireworks. I am an RN and now am worried more about lymphoma and wondering if 3 months is too late for a follow up. [/INST] As u have a history of asthma I think most probably it was the exacerbation that caused the shortness of breath. D-DIMER test although positive the CT chest turned out to be negative for an any pulmonary embolism. The lymph nodes may be due to tuberculosis if their us any necrosis mentioned however they won't cause any breathlessness of acute nature. Kindly see a good chest physician for further queries and thorough examination </s>