It is difficult to lose someone who u loved. But if it is going to the extent of depression and anxiety it needs to be evaluated and treated. Try to keep urself occupied in things of ur interest and give it time.Ur problems can be easily treated with counselling and if needed medications. Don't let ur problems affect ur personal or professional life. U need to consult a Psychiatrist. U can also consult me online directly through the Practo chat option. Best wishes for speedy recovery!!