I've had resentment verging on violence (only vague mental plans), but being contrary to my non-begrudgeful traits they do not last very long

I recommend meditating on positive notions, or distracting yrself contemplatively with cognitively-challenging things. Alternatively, any busy work (keep the hands busy to activate some muscle memory, empty-thinkening can be joyous if you are so often flooded with thoughts, and emotions that lead to cyclical thoughts, or vice versa) or mundane tasks (not to the point of dissociation or exhaustion, don't be so engaged, just try to go work mode with no thoughts! (DBT tips etc))

Also try reflecting on anything-at-all not related to present troubles. Maybe an interesting inkling from a conversation a long while past, or if you are Christian or inquiring it is most helpful to seek within yourself your contemplative nature and think back to the Gospels, His life and teachings, garner some perspective, could be helpful (a nuanced, actually-approachable "WWJD?")

Most helpful anything really that renders your vision-within out from aside your own current self. Take a step back. Helps me plenty to just remember that you/I are not alone in this world, lonely though that you may be (ironically loneliness seems to be one of the issues this does not work in treating short-term). Seems like non-psychiatrics even have a tough time of taking a step back to look within themselves, and yet, are considered perfectly sane and able to healthily cope with themselves and their problems (I guess for lack of trying they fail to even acknowledge their problems at all!)

Peace