Hi, sorry for your frustrations....hopefully you will get answers soon. your story sounds alot like my son's. i was always told it's a virus.....then asthma...then both...and i was persistant that "something wasn't right"...so they finally sent my son to pulmonologist, who preceded with testing for CF. yeah there may be a chance your son only has asthma, we hope, but it won't hurt to test for sure, and give you peace of mind if it is only asthma. if it's cf, then he can start proper meds and start preventing cf damage. as far as family history......there isn't any in my family that i am aware of....and i also turned down carrier testing when i was pregnant, because there wasn't any family history, and my other 3 kids were "fine".
so definitely push for testing...better safe than sorry. good luck and keep us posted!