What are some ways for me to diagnose sleep apnea?

Sleep test: Professionals screen for apnea by asking questions and observation. Enlarged tonsils, snoring, large neck, obesity are all risk factors. Wakefulness, restfulness, alertness, all alert to the possibility of osa. Overnight sleep tests, either in a center or at home under the supervision of a sleep md, will provide all the data needed to confirm the diagnosis.

You really can't: You can't self-diagnose SA because you sleep through it. It is usually the bed partner who gets clues of hearing gasping, choking, or moments of no breathing. The sleeper has no knowledge of the event! Some who do suffer from SA have excess daytime sleepiness, doze off while watching TV, etc. If you are suspicious that you might have it, get a sleep study done. It is painless and very easy.

Symptoms: Obstructive sleep apnea symptoms: http://www.mayoclinic.org/diseases-conditions/obstructive-sleep-apnea/symptoms-causes/dxc-20205871 If this sounds like you, you need a sleep study to diagnose.