Lin, here’s what I suggest you do:
Have a nice balanced meal with your son, then “read” him to sleep.
Make a nice warm bath for yourself with soft music, candles and natural fragrances
Close your eyes and breathe in deeply and breathe out slowly ( at least 3 times) focusing on the breath.
Get out of your head and drop the drama and reach back into your heart centre.
“Go to thy bossom, knock there, and ask what your heart doth know.”
Replace the blaming, arguing and competing with respect, gratitude, compassion and unconditional love.
Infinite love to you.