Hoping you had a good and positive meeting today at your GP today..I am so sorry to hear you have felt ignored after your Biodesix blood came back and gave no definitive answer..
Thank goodness you have now been referred to UPenn and hopefully that appt is soon.
Try not to jump to any conclusions as it could be mycobacteria recurring but you need tests to find out what this approx 2cm nodule is and need them ASAP..Wishing I could be of more help as this is a frightening situation and thankfully your GP is aware of all. Thinking and praying for all good results