Hi,
It's great that you're reaching out for support and Being a mom is most certainly not easy, and in fact can be far from it. The feeling of tiredness, laziness and having negative thought pattern is one of the most common woes among new moms.
Self-help and Supported Group - Talk to your loved ones or other new mothers who can help you feel supported and remind you that you're not alone. Making time to do things you enjoy, exercise regularly, and eating a healthy diet.
Next Steps
You can see a Clinical Psychologist, have an assessment for the severity of your symptoms. And then she/he can refer you to a Psychiatrist, there are amazing pharmacological treatments without any side effects. And then you can continue with therapy. You will have amazing outcomes with these two. And this issue can be treated from the root cause.