i experienced the same thing i feel you man, i jumped from splinter to splinter and seeing the sharty decline made me extremely depressed
the only fix for me was changing my diet to improve my mood (im on a lazy primal diet) and self-medicating with drugs (tramadol,ritalin) whenever neccesary so the depression and anhedonia doesn't literally ruin my life
im still working on moving on from what happened but it's hard, i recommend you try doing something artistic or whatever feels best for you like playing videogames or some shit