Hello Friend, Good that you are seeking help.. Negativity, feeling low, lack of interest, nervousness, sleeplessness etc are symptoms of Anxiety in your mind. Just observe and analyze what has majorly changed in your lifestyle. Any career/ job related tension, relationship or family issues, any illness etc. Any of these could influence your thoughts and trigger such depression.
Be positive. You can address it by taking a help of a psychology counselling expert.
Next Steps
Call me directly or reach out oline through practo for further evaluation and suitable recommendation. Be positive. You will be alright soon.