Hi!
In my case I have been
underweight all these years in which I had the symptoms that have now disappeared or improved with the CPAP (This is the only way I have to be sure that I had the apneas all this years before the diagnosis).
So definitively, weight was not a factor in my case.
Also thanks for your advices about the CPAP!
So far I tried two masks

I will keep on fighting with it!
Same here! I am underweight and rarely snore. I had 4 sleep studies done, all came back inconclusive or negative.
I tried to explain to the doctors that i don't sleep well with that damn computer around my middle and all the wires and tubes around my face. This prevents me from sleeping in my natural position which is more on my side or stomach.
So, I suffer from ALL the sleep apnea symptoms and my wife told me sometimes i just stop breathing or breathe very shallow. I asked the docs to just try out a cpap or apap machine, but no... the test is inconclusive or negative so the insurance won't allow it. I'm now considering buying a CPAP or APAP online somehow and just try it out by myself because this problem is really taking its toll on my quality of life.
I do NOT take no for an answer any longer, i'm 100% sure the problem is sleep apnea. SO here i am yet
AGAIN, trying to figure it all out by myself because these docs have to adhere to standard protocol which just doesn't suit me.
There are days, like 3 in a year where i wake up feeling "normal", like sleep apnea didn't occur that night, the way i then feel is like a difference in day and night.