[Sleep Apnea as a Secondary to?]

 I just filed my first claim with the VA 20 months ago. I have successfully been awarded tinnitus, anxiety disorder, asthma bronchial, and headaches.

I began using a CPAP 10 years ago at my own cost and have been since. Since registering with the VA they now provide supplies.

I badly want to connect sleep apnea to my service for obvious reasons and daily I am fearful of the regulations changing.

I do have two buddy letters in support. One was from my wife while on Active duty and one was from my 2nd wife, now my 2nd EX.

I am a Gulf War-era vet so I get those presumptives associated with that era. 

I have a CT scan scheduled for next Tuesday for sinus because I do suffer from sinusitis but I haven't filed that claim as of yet.

 Would any of you recommend filing sleep apnea as a secondary to any of those mentioned above or should I risk it and wait on sinusitis? Which could be months.

 I fear the VA will say it is because I've gained 50 lbs since serving, rather than connecting it. 

If I claim it and gets denied can I re-claim later as secondary to something else?

 I am sorry for the long post. I promise I will be reading as many posts on here as possible in the coming weeks so I do not ask questions regularly. 

Thanks for any advice.