Are you quite certain the depressive episode developed organically and Tiktok reacted to it? Maybe the algorithm started subtly on that path two days before you noticed the episode and you only realize once it starts showing self-harm content?

Hmm, that's quite possible (and concerning to think about)

It had been showing me depressive content for days / weeks beforehand, during the start of the episode, however the sh content only started (Or I only noticed it) a few hours after I had a relapse, so the timing was rather uncanny