Im sorry you are feeling this way but my opinion if you are feeling like doing something like hurting yourself or other ie suicide, self injury or homicide what ever there are other ways to handle problems then doing yourself or others in. and most people I know do not see such actions as heroic of for the best of others..

think about the pain you are in... do you really want to leave others you care about and think you are thinking this will be better for them, with the kinds of problems you have or worse? would you want them to feel nothing but rage/anger and believe you to be a selfish person even though what you may have in mind you think is for their best interest?

my suggestion yes by all means tell your treatment providers and work with them on this problem, they can help you come up with a less violent way to solve what ever this problem is you are having.