Have you tried Affirmations or meditations?
Lots on you tube, mindful movement are good, Wayne Dyer, Louise Hay, all accessible.
Affirmations are good because of the repetition aspect, as someone mentioned earlier, the brain is plastic, and since childhood you have had some negative messaging, affirmed by partners and internalised by yourself.
How many times they/we put us down? This becomes so ingrained/trained into us.
We can begin to tread a new pathway using Affirmations.
You could write some of your own and stick them up around the house.
Maybe write out what mathanxiety said about the planets. Bring positives and truth to the front of your mind.
Journalling has always helped me, getting all my feelings out and on paper at the end of the day. I seldom read it back but it was very useful to spill my pain and successes daily. Something about writing things out showed me the truth, rather than whirling in my head, haunting me.
Are there any baby groups in your area? Could start to fill the calendar with some new stuff for you and DD.
It's a new year, new start, you are completely free and single.
Can create a whole new life for you and DD, one you really love to live! A day at a time, chipping away at old thoughts and patterns that no longer serve you.