Become highly negative about things.

I understand your situation. You seem to be suffering from postpartum depressive symptoms including feeling low, irritable, anxious, ruminating, worthless, helpless and negative. More clarity is needed regarding your problem. Information regarding your sleep, hunger, energy levels and concentration at whatever you do would be more helpful to decide on the severity of your condition. Don't worry it is not your fault, it is the hormonal changes in your body after delivery which is taking a toll on your mental health. However it is easily manageable with appropriate treatment, so that dysfunction due to the same can be reduced and your quality of life will improve. Some counselling sessions along with medical help might be useful for you. 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.