Where does your husband work ? Can't he switch his job and stay with you so that you guys both can contribute in parenting?
If that is not possible, you can hire a full time help so that the burden is taken off you.
Also , you could ask your parents and in-laws the reason why they are unwilling to help you.
But you do seem to be having depressive symptoms for which you should seek professional help.
Next Steps
Please consult a psychiatrist online or in person