Triple negative BC, mets to lung

i went to see my GP as I had a pain in the back (right side) under my ribs (can only describe as deep within ache) that did not go away with Panadol mainly at night. Also had developed a seroma at front on right side underneath mastectomy scar. GP physically examined me and immediately arranged CT on lung to check for blood clot. Result within an hour showed no clot but pleural effusion and also changed to lung since last scan (probably metastatic). I had a appointment the next day with my surgeon, so results sent to her, whilst she physically examined me she found a few nodules along the scar line she didn't like, so arranged next day to drain seroma, and take out nodules and sent all for testing. She organised an appointment with my oncologist for following Tuesday when results of biopsy would be available. Results of nodules showing same triple negative cancer growing bizarrely and seroma fluid having unusual cells being malignant.
Now I'm to have a PET scan, a brain scan and blood test next week so I go back to see her on 20th. In the meantime I'm on Targin twice a day, plus panadol every four hours, and I have endone for breakthrough relief if I need it. It's all happened so quickly !  So now I've developed a small dry cough on occasions but not all the time and also shortness of breath when I do a simple chore like vacuuming with a little stick vacuum.

i haven't found anything here (only a quick look) with mets to lung.
Anybody out there ???

thanks