Treatment resistant depression is difficult to manage. Especially if you don't respond to the latest in the treatment options (psychedelics). And yes, it is needed to go through it with professional(s) because otherwise it can mess you up even more by retraumatizing you if trauma memories surface and you relive them.
The term depression exists because it comes from people who don't have it (so that's their subjective view, "that person has depression" - a term that is used to differentiate between neurotypical healthy being and one afflicted by an illness; I'M NOT SAYING PEOPLE WITH DEPRESSION DON'T USE THE TERM). It's worth noting that we all have a desire to heal (innately), though not all of us want to heal. The point is, we all know what is healthy once we've experienced it and realize there's more to life (even if it means just coping [tip: everyone is coping, nobody is superhuman], it just matters how you cope and manage your symptoms). For disorders, like the one I've, C-PTSD, I can only get to a point of having healthy coping mechanism but it doesn't mean I will never in the rest of my life have moments where my brain tries to pull me back to old coping behaviors (unhealthy and, to be honest,.accompanied by all the symptoms it comes with).
It's important every single one of us tries absolutely everything in our power to heal. And if we fail, then each one of us has to take a decision.
For me, it's having been retraumatized at work due to countertransference with my therapist and ending up (again) in a complex trauma environment (where it's impossible to resolve the abuse, neglect, abandonment, hurts etc. that come up - this is what complex trauma means). It's an environment of captivity and, honestly, after around 30 years of living like this, I'm tired. I don't want to become short fused and an abuser to other people because of the abuse I'm subjected to and I don't want to enable my abuser because I'm unable to put boundaries and the ones I am trying to put are squashed by the shelter manager.