Hello sir, I n understand the distress you are through. Hopelessness, low mood, negative thoughts, etc are some core features of depression. Stress is an important risk factor for it. With suitable medications and instructions it can be completely cured. The management would consist of medications and therapies to strengthen coping strategies to stress.
Next Steps
My suggestion would be to meet a psychiatrist soon. Do not wait for the problem to subside on its own, it may worsen if not treated timely. With treatment, you ll be able to love a healthy life. For specific instructions on management, you can also consult with me directly here on practo.