I feel like my life is over, I will most likely be caring for my daughter for the rest of my life, as selfish as that sounds It is hard to think about, I have no family support, I can’t use baby sitters, it’s not possible with my daughter and I never get a day off the only time I have to myself is when they are at school and in that time I’m so exhausted, I am struggling to take my children out on my own as it’s too hard and we only go to school and back, I spend most weekends sat in the house as I can’t take them out on my own, I don’t have the energy to do anything
I feel so bad for your exhaustion, it sounds really really challenging and like you're doing well under really difficult circumstances.
If it helps you move towards letting go, making a decision to release your anger towards your ex will ultimately reduce the exhaustion you feel.
Anger generates energy within your body. It's kind of like caffeine in that way. You get a hit, and it powers you on for a while, but it also comes with negative side effects of jitteriness, a bitter taste in your mouth, a feeling of dependence on the substance to keep going.
If you quit drinking coffee, you will definitely have a few days or even weeks afterwards when you feel really flat, lacking energy and focus, while your body adjusts to the new reaction of no 'quick hit'. But you will adjust over time and find a new, healthier rhythm, and better habits to improve your energy (like getting more sleep, exercising etc).
In the same way, if you decide to go 'cold turkey' on thinking about your ex and feeling angry, for a while afterwards you will probably feel flat and confused and empty, like you don't quite know what to do with yourself.
The key is to identify when you tend to feel angry at your ex (is it when the kids are asleep and you have time to yourself to think? While you are struggling with managing them and need a 'hit' of energy to cope?) and replace those angry thoughts with empowering ones that build you up emotionally instead.
So instead of "He's such a fuckwit, leaving me to battle with my kids' needs by myself", try "My kid is having such a hard time through no fault of her own, and having a strong, loving person like me to help her with her challenges is going to be so good for her over time."
Or instead of "I have nobody, I'm so lonely sitting here by myself because that asshole abandoned me", try "This time now is completely for me to use to benefit myself... I can read whatever I want, soak in the bath, make new friends online, explore an interest, paint my toenails – any small thing that makes me feel good and as though I am caring for myself and treating myself with love."