Nick,

It sounds like you may have sleep apnea. If you stop breathing while you sleep, you brain gets deprived of oxygen and many functions become problematic.

You need someone to watch you sleep and see how you are breathing. Sleep apnea could easily be a big part of your current symptoms. Central apnea can be the result of an upper neck/brain stem injury that gets inflamed from time to time causing your intermittent problems.

I know the terror from sleep apnea.

My best to you.