Hello Friend, Good that you are seeking a help here. I can understand your suitation. All the mentioned symptoms are sign of depression. What you need is a source to ventilate your emotions, feelings and concerns first. With that you will also explore yourself to find what's causing such lack of interest, depression, loneliness, negativity etc.
Take a professional counselling support to do this excersise first to identify the root cause and suitable solutions to recover back. Be positive. It's an addressable symptoms.
Next Steps
Feel free to reach out to me directly if in blr or online through Practo app for further detailed evaluation and recommendation. Be positive. You will be alright soon.