Merry, I am so sorry to hear of your stage 4 diagnosis and all the other issues going on. How are you managing? I had breast cancer, two years out now, no chemo, 21 radiation treatments and the lovely Tamoxifen to hopefully keep it at bay. The last time I remember my SOB being this awful was a month or so after I finished radiation. Spring season, that's why I feel it's allergies or pollen causing the SOB. Mind back then I went to emerge, was told I had a blood clot and stage 4 cancer. Turned out the ER was thankfully wrong, but sometimes I wonder if the spot on my lung is cancer and causing the SOB....