If you suspect you do have sleep apnoea then get yourself properly tested. That may mean a night in a sleep clinic, or it may mean a night at home being wired up to a set of kit that monitors your pulse, O2, respiration, etc.
The results will let the medics know if you actually have sleep apnoea.
Sleep apnoea can be fatal; recent studies show that someone with untreated sleep apnoea has less than a 75% chance of living to 60 if they are 50. The usual cause of death is either a stroke or heart attack, as during apnoea your pulse can reach 200 or more as your CO2 levels increase. Sleep aponea treatment is simple; it's using a CPAP machine every night. If you don't have sleep aponea and are otherwise healthy, you have over a 95% chance of making it to 60 if you are 50.
I don't know if having treated sleep aponea means a class 1 medical cannot be issued, but certainly in the maritime profession, treated sleep apnoea is no reason not to have a medical certificate issued.
A friend of mine (a senior cruise ship officer) died in May 2015 of a heart attack, probably due to untreated sleep aponea - he was in his early 50s and very fit for his age. The medics (ER/Intensive care specialists) were with him within two minutes of his heart attack but they couldn't save him.