Looking back, you may be able to see how you got here.
What you thought was being good and selfless actually meant you weren't taking care of yourself.
You made time to help, bent a little, and when that wasn't enough, you bent a little more, then a little more.
You put off your own "unnecessary" things for later.
Well, my friend, later is now.
Please take care of yourself, learn to say "no" when they can actually manage, and make time for you.
It's your turn.