Hello tatzie,
I too went thru many doctors, i have both asthma and vcd. VCD Vocal Cord Dysfunction. I see the top specialist in asthma and vcd.
If you are taking meds and you are not getting relief, it could be vcd, vcd happens because of heartburn that is uncontrolled for many years and it causes the vocal cords to be reactive to some of the same issues, ie pollens, dust, allergys.
Asthma comes from the chest, when bad it feels like a boot on your chest. VCD comes from the throat, you can hear and feel the vibration, no meds will fix this problem, sorry, its only fixed by doing breathing exercises, go to this web page http//:icantbreathesuspectvcd.com read everything and get your family doctor to send you to a lung specialist and a speech therapist, they can teach you the difference. all the best ww