I am curious, you state you've had small improvements. What seems to have helped? You listed a lot of supplements in the last thread and I wonder if you have determined which, if any, have made a difference for you. 5-HTP stands out for me, I wonder if you are experiencing less depression and have tried changing the dose or considered an alternate supplement (I just switched to L-Tryptophan and it's working much better for me, St. Johns Wort and SAM-e are other options).
I most likely have sleep apnea, but have never been formerly diagnosed (confirmed with a sleep study, because they are expensive). My doctor said it was highly likely I have sleep apnea, despite being a low/normal weight for my height all my life, because I very occasionally wake up to catch my breath when sleeping on my back, and am somewhat congested all year round (mold allergies are likely the culprit there).
I am also curious how your clarity of breathing (congestion) is now.