Hi dear, must be difficult for you. I can totally understand your concern and feelings. please don't be harsh on yourself, your mother surely dont mean that. There are many possibilities for this behavior. It need detail interview with your mother. I know it is very painful to see your mother like this.

I understand your distressful situation. Your mother seems to be suffering from adjustment problems with few depressive symptoms including anger, negative thinking etc. However more clarity is needed regarding her problem. Information regarding sleep, hunger, energy levels, interests and concentration at whatever she does would be more helpful to decide on severity of the condition. Her personality traits need to be evaluated in detail as well. It is manageable with appropriate treatment, so that dysfunction due to the same can be reduced and your family's quality of life will improve. Some counselling sessions and if needed medical help might be useful. I would also be more than happy to help you with that if you are looking for online assistance. Discussions will be held confidential. You can directly consult with me through Practo as needed. Online chat consultation is available.