Hi Stephanie

I haven’t experienced leaving an intimate relationship with a young one to think about but I do identify with how you feel. My confidence and self-esteem are terrible and I too lack energy and motivation to do much of anything. I recently got into a new job and had to quit after about 2 1/2 months. The supervisor who seemed ok to start with turned very vicious (psychologically) and she really tore me down. Anyways my point is that I “feel you” as the kids say these days. = )
I’m so glad to hear that you are talking to your friends and that you have your mum supporting you as well. That alone is huge in helping get through stuff like you’re experiencing.
Your son is experiencing loss and upheaval in his life and unfortunately he doesn’t have the cognitive faculties to express his emotion, yet. You probably do this already but spend time with him and talk to him about what is going on. Are there any activities you both enjoy? This could be good for both of you to focus on some happy stuff for a while.
At the risk of sounding like some “buddha lite” type your emotions will change, do change moment to moment. I would really encourage you to grab a little “me time” if you can, say after you put your little guy to bed and meditate (if you don’t already) and just focus on your breath. it can really help give a bit of “breathing room” with our emotions. At least it has for me.
You could try using “This too Shall Pass” as a mantra during the day.

And for what it’s worth, things are already getting better. You took the first step to improving things for your self and your son by leaving a relationship that was unhealthy. The analogy that comes to mind is of lancing a puss filled wound. It hurts, it’s NO fun but because you allowed the “puss” to drain the healing will happen.

I hope something in all this rambling is a bit helpful. If not just toss it out!