Hello,
I am soooooo glad to hear your problem! I too. have been dealing with something nearly identical. Mine will get so bad at times that my breathing becomes short, and even labored. I have done the ENT visits, the asthma meds, the GERD/LPR stuff (which oddly enough, breathing the straw actually helps), x-rays, CTs . . .

I have some questions for you, if you do not mind:

1. Do you have the issue when you try to cough the lump, congestion/phlegm up, but, it is almost as if the cough/air does not reach the area where the mess (lump, congestion, phlegm) is? Like, if your cough would reach that spot then all would be good. And also, does your cough feel like it is . . . cut in half, or missing a certain part of the windpipe, or like you can feel the cough in your entire throat except for 'the' area. Like somehow it is going around 'the' area.
2. This may seem weird, but I am just trying to figure this out. Since this started (last Dec.) I have not had a single booger <-- sorry, but it is true. What's more, I go through a box of tissue a week. The crazy part about it is, when I do blow my nose, the tissue has very, very little substance on it. I am talking a drop or two. THAT IS IT! Even though my nose feels like it is packed full and one tissue will fall to pieces.
3. Since you have posted, have you had any luck with doctors? If so, PLEASE, PLEASE give me anything that can help. I will definitely do the same.

Thank you for your time. I hope that we can get through this.