Just wondering - does the ideation vary depending on your medication or supplementation regime/dosages? I'm not surprised that suicidal ideation could be associated with prolonged PCS, but it might be worth paying attention to the effects of any meds/supplements you're taking (and any recent changes to that regime).

Also, the days are getting shorter, so if you have seasonal affective disorder, that could be a factor as well. Just throwing out some ideas from a strictly non-professional point of view (these might be totally irrelevant factors in your case).