What to do if i do not know why i'm so depressed, so i hope somebody can reply to this and give me a solution.?

Psychotherapy: It may take awhile for you to either find the answer to 'why?' or to decide that it's not the most important question. But either way, good talk therapy can provide help. As you talk, issues that are tangled up may become distinct and manageable. Learning skills to improve your situation could make it less impoortant to discover 'why?'.

A solution....: Start with a medical evaluation to rule out medical causes of your symptoms. Medications are sometimes indicated. Talking therapy to include Cognitive Behavioral therapy or psychotherapy can be effective. Aim for daily exercise, 8 hours of sleep per night & good nutrition w 5 servings of veggies & 4 of fruit per day. Try tai chi, yoga, Qi Gong, progressive muscle relaxation, deep breathing