Why do I feel so sad all the time??

Sadness. Sadness is a frequent symptom in depression, but I don't assume a diagnosis. Recommend you see a good Psychologist for full history taking. Sadness is part of grief, but can become a problem if it impairs your ability to enjoy life. Don't give up-there are effective therapies and effective meds(not addictive). If you feel suicidal or self harm please call 1-800-784-2433 hotline if you feel urgency.