Why are my dua's never accepted..?

If I had one wish it would be that I can see my father again and give him a hug and tell him i love him so much...my pain in my heart is unbearable and i seem like that i have this huge void in my heart ...i do not know what to do ...when will this pain go away...i miss my father..my loss of my father has brought me to question our existance...why would allah swt put us through so much..why ...i had already lost so much already in my life...my marriage, my children, my job and loosing my father was like the icing on the cake..i dont understand ....i make dua all the time but it seems none of them are ever answered...my sorrow is turning into anger and i dont want that...when will my duas get answered...