continue or give up?

I have taken the Ph. D examination twice, and I got the same result, I passed the first examination but failed in the interview, that is, I failed twice. Last year, since I was lost in the depression, I didn't prepare for the examination enough. Actually, by now I feel I'm still in the depression but much better than the year before. I don't know what should I do, continue or give up? To be honest, I want to go on, but I find my emotion is not in a good condition, and I always feel less confident, looking down upon myself. I don't know how to get out of this situation. Again, God help me!