breathing tests

Im having a breathing test tomorrow. For almost two weeks ive been short of breath, cant get a deep breath in and some chest pain. Ive also had increased heart rate as well. I had a blood clot last year so ibwas convinced I had another one. Ct scan was negative. I also had an echo which was fine. Next step breathing test. Please pray this shows something so I can figure out whats going on with me. Im scheduled for surgery march 21