You’re worth loving, and I bet your kiddo and partner love you. You are worthy of rest and to feel good. I don’t know how you get here but I know of three people just from your story who are better off having had you in their lives - your kiddo, your partner, and you.
You can do this! One step at a time.
I’m not going to pretend to be an expert. I don’t know. But I heard someone who does know speak about this and maybe their words will help you https://youtu.be/d4pukDZ_CgQ