Hi there
You've made some really big decisions about friendships in a short time. No wonder you feel alone. The women who wanted you to help them through their divorces sound a bit insensitive. Could you have just distanced yourself for awhile, rather than ending the relationships? The one who was sucking you dry, well, good on you for realising and acting on it. The one who told you to go f yourself - that's harsh. Doesn't sound like she was much of a friend.
I have cut relationships off before when they hurt me. Friends and family. Sometimes permanently, sometimes not. I have never regretted it, it needed to happen. The ones who are real are still around.
The only relationships I would never sever are those with my children.
Hugs