Berta/Buck52/JBasser,
Thanks for all of your answers! Berta, yes, the OSA diagnosis and treatment are well-documented in my records. As to the other conditions I listed, they are all documented on my Separation History Physical Exam that was completed by my military treatment facility on base.
As to the OSA and restrictive lung disease, here's a little more background:
Six years ago (on active duty) I was diagnosed severe OSA. Since then, I have religiously used the CPAP with good results. About two years ago, I began having symptoms of dyspnea and chest pains. My wife noted that my lips were blue when I woke up in the morning. One Monday when the chest pains began to scare me, I headed to the emergency room where I would spend the next eight hours receiving tests. It was at that visit that doctors first noted my SPO2 levels dropping into the mid- to low-80s as I was sitting reclined on the hospital bed. I was prescribed oxygen immediately. Tests revealed my heart is in great shape (other than an aortic aneurysm of 4.3 cm) and my lungs were clear save for a few nodules and "cackling" sounds heard by the doctor with her stethoscope. Also, my PFTs indicated "Lung volumes show moderate restrictive ventilatory defect with total lung capacity 60-69% predicted".
Noting my "blue lips" upon waking, a sleep study was conducted soon afterwards which indicated my SPO2 levels dropped to 88% and below for an hour and a half, cumulatively overnight, even though I was properly using my CPAP during the study. The sleep doctor recommended I begin using 3ml of oxygen therapy with my CPAP therapy to correct the problem. She noted "He had no respiratory symptoms until he was exposed to desert dust and burn pits while in the military, and can still participate in military training exercises, though finds it takes more effort and is more tiresome than it was in the past".
I'm thinking that if the restrictive lung disease isn't connected to any of the other conditions, then maybe it'll be "presumptive" as a result of my Gulf War service ('90-'91).
Anyway, on a side note, I pushed "Send" on my VA claim this past Wednesday. On Thursday, a VA rep called me with a couple clarifying questions related to my claim (I submitted tons of records). On Friday, the claim was forwarded for evaluation. I hope the evaluation goes as quickly and is favorable, too!
Again, thank you all for the great discussion!