Hi- very long flight but welcome home - I'd have to unconscious to fly that long! (I prefere 2 or 4 seater planes!)

On SOB - if its going, as you mentioed, which I get on and off - my docs say its due to autonomic heart issues... However, also, I've gotten SOB just from stress on the muscles in my chest - and if you were confined for that long and sitting - could have just put unnatural pressure on your chest area too.... hope you feel better soon!