Hello Friend, Good that you are seeking a help. All your symptoms are sign of deep depression. It's better to take a professional help to figure out the reason or root cause for this emotional imbalance and identify suitable solution to overcome. Don't worry. Such emotional imbalance are just like any other physical illness and can be treated through counseling session and few lifestyle changes or therapies and meditation. Don't hesitate to consult.

I feel there is a lack of clarity with respect to Purpose... You might get some clarity, by Consulting a psychologist in your city personally.