There's a lot of good advice here, so I won't repeat what others have already said. You mentioned you have sleep apnea, do you have the machine (can't remember the name) to help you breathe. If I remember right, it creates a white noise, my hallucinations often distorts white noise into auditory hallucinations. The more my anxiety increases, the worse my hallucinations get. Definitely practice things that will work on your anxiety and see if that helps at all.

And, as far as I've understood it, it is perfectly possible to hallucinate due to extreme depression (especially if anxiety is mixed in). Also, lack of sleep is a one way ticket to psychotic symptoms as well, so try and work towards better sleep if you can.

Take care and PM me anytime.