Help with breaking codependency

I am very anxious, have ADHD and depression as well, realized the hard way that I am codependent on my closest friends. I am too clingy and rely too heavily on them for emotional support. I know in the long run I need to break this cycle of behavior when it comes to friendships, for the benefit of everyone, but being without those friends temporarily feels incredibly painful right now. What can I do to help break this codependency? What can I do in the moments when it hurts?