Spiritual fatigue often follows deep trauma or chronic situations.......it sounds to me that you are grieving.......grieving for your family, grieving for yourself, grieving for your child and so on. You are grieving for the moments of joy that you don't have......
The thing with joy and contentment is that it takes a lot of hard work and practice to acknowldege and participate in these feelings. Especially when life feels so "hopeless". It is hard to be joyful when "life" gets in the way.
The good thing is, is that you are AWARE that you are suffering. You know that this is not what you want. The hard part is working out how you can get what you want.......the answer always and only ever lies within. Sometimes though we need some help to process the barriers that are in the way of gaining our inner truth. Do you have someone professional that you can talk with?
Know that we are here, that you are loved dearly, and the answers WILL come.......I guarantee it. LOOK WITHIN. Keep talking and take care of your very precious self
Michah