For the past year I've noticed a slight, faint wheeze when I exhale. I've dismissed this as nothing I should worry about as it's only faint. However, twice in the past two weeks, the wheezing has gotten worse after coughing fits. Both of these fits begin with a slight cough when laying on my back, watching TV (at the foot of the bed). A tickle develops in my throat and the coughing intensifies, lasting for 20-30min before the urge subsides. During this period my breathing becomes raspy and wheezy, and I occasionally cough up small amounts of yellow phlegm.
I've had a couple doctors listen to my chest while I breath, but they say everything sounds fine. What do you think might be happening? Any and all opinions are appreciated.