I’m sorry a lot and understand your situation better then you explained deeply what is going on in your life now and the stress you are dealing with, nearly alone.
You are in a vicious circle. Depression rest lots of energy and it’s needed a time for yourself to recovering but with all that stress and responsibilities.
You were told very insightful words here and you already notice that you need a help. So, let’s do the best for your kid and for you, let yourself help. A person is not a superhero, and when stress hits, depression grows. Let your doctor, your family gives you a hand.
What OliberB said about taking something for a time to let you sleep and recharge energy is very important. Since depression tends to steal lots of physical strength too.
We support you here.