Sleep Apnea Treatment

Could mouth breathing be the culprit since I only use a nasal mask, still only able to stay up 12 hours a day. Plus I take stimulant medication for fatigue, provigl and dexedrine at fairly high doses. Its becoming frustrating I feel groggy and physically weak but not as tired as I was before treatment. Plus I don’t get severe sleep attacks like I did before so it is somewhat working. Any help would be great.

Last night, I woke up with pains in my chest(what felt like heart area) and when I took a few deep breaths, the pain began to go away and I fell back to sleep. Could this be sleep apnea and because I wasnt breathing, my heart was not functioning properly, and therefore causing the pain?? I’m scared about this.

I have a sleep study coming up. I’m not convinced I have it… but if I do, will the study catch it for sure? Or could I possibly have a “good night” and they wouldn’t detect it? I guess I’m asking if apnea can be an occasional thing, like a few times a week or if it’s always every single night. I frequently wake up gasping for air, but not every night.