Sorry for the delayed update.
I asked about UPPP for sleep apnea on my original post. Here is an update as to what had happened. I did go get another sleep study done, out of pocket but was able to get 75% reimbursed. Once I got the results, the Doc prescribed the use of a CPAP machine. I turned in all associated documents to the VA Claims department. A couple months later, I received a letter stating that my Sleep Apnea was now rated at 50%!! This was in late 2019. In April 2020, I received another letter stating that my Sleep Apnea claim had proof that I had it when I still in service in 2007. So, they back paid me from 2007 to 2019!! VA disability and military pension both had to go thru an audit. This was very good news. I could not believe it. Thank you all for assisting me.