Anon, not sure if this could be helpful, but I think I discovered a little thing, & being that I relate entirely I humbly offer it in case it might be helpful in some way.
I agree with the above, but I've often wondered, what does it men, "Depression lies", or "PTSD lies"? (I really agree with the second one, too).
I think I've figured this out: they said in the "Mindful Way through Depression", everyone expresses the same thoughts/ beliefs when depressed for the most part (that's how we 'see' it's a lie). And I've long-since realized PTSD twists my head in the way of looking for 'explanations' of why I feel as I do (for example, not recognizing a trigger, explaining it in other terms- therefore it affects my perception, & alters my reality). I was also taught by a Veteran on here that low-grade anxiety feels like not fitting in (& I related a lot to his experience of triggers & fear(s) ).
I think I've confused for a long time 'feeling badly' with being a consequence of PTSD/ the traumas, but actually, if there is a way you can let yourself feel badly (I'm not saying grief, though that has it's place, but rather re-living or more so re-experiencing, with the feelings that for survival or otherwise couldn't occur then), the bad feelings reduce/ go/ get reconciled. And I don't mean 're-experiencing' as in the FB's/ intrusive thoughts (symptomology) we get every day, but rather feeling what we did then but couldn't express, & experiencing it now. It seems to help, & would also be exactly in line with why somatic therapies work for some too ('releasing energy/ The Body 'remembers'), etc. Or why 'stuff' comes up mostly only when we feel 'safe(r)'.
I am wondering if this is key? For example, someone said here during a terrifying moment they were thankful for their abuser's 'patience'- totally understand the need for that thought/ 'feeling' then. But what (we) need now is not feeling 'patience' re-living & recalling such times, but terror & horror, etc- what anyone would feel at such times (the 'normal response to an abnormal situation' not possible then).
Then I just found, much of the feeling of 'future' & such, goes away, as does some of the pressure to die. The 'present' feels differently too, because the perception has changed.
Hugs++ to yu, hope this makes sense.