Hello Friend, Good that you are seeking a help here. Emotional disturbance like Depression also affects your physical health through sleep disorder , lack of appetite, nervousness, low on energy etc. You are experiencing few of these now.
When you have identified such emotional problems are affecting your day-to-day life, then better take a professional help to assess your suitation in detail and isolate the root cause for your depression. There a suitable solutions like changes in your lifestyle, self therapies, excersise, dietary etc can help you to overcome this problem.
Don't hesitate to consult a Psychologist directly or online.
Next Steps
Feel free to reach out to me online through Practo for further detailed evaluation and recommendation that you can follow practically. Be positive. You will be alright soon.