I did have a long bus trip to CO and I am on BC. I'm not having difficulty breathing so wouldn't that rule out the PE? 10K is high for someone who lives at 600 ft above sea level. I don't have an appt to see the doc again. Am waiting for them to call me with an appt for a stress test. Didn't have the pain last night but got it this morning. Rolling on my side didn't help this time.