it may well be the same test, just dont overdo it!! only do what is comfortable. if you get time, try some breathing exercises, for example, breathe in for a count of 4, hold for 4, breathe out for 4, hold for 4 and so on, its good for relaxation. but try it somewhere quiet, where you can get some peace. also, during a quiet moment, try to breathe slowly and steadily, in through the nose, out through the mouth, and try to empty your lungs fully. again, dont overdo it, just what is comfortable.
try not to worry about the test, the doctor/nurses will look after you and have your best interests at heart. remember that you may well be a little fitter this time, since you've quit smoking, and taken up cycling, you did mention you've noticed an improvement already!!
remember you have friends on here who can give moral support, even if its just allowing you to blow off steam. its better than you going back to smoking!! keep us updated! x