What is it exactly, Wendy, that you are fighting for?
You can begin by being an altruist toward yourself first. There is no selfishness in that.
Seeing your own needs ALSO, finding balance, taking a time out, can prepare you for whatever you feel your purpose is. Also, questioning why that purpose.
I don’t think that “true” altruism forgets self to the point of destruction.
Selflessness doesn’t necessarily mean losing Self.