Missing someone has to be one of the worst human emotions. All the other feelings like anger and fear and horror get some much more airplay, as if their intensity gives them more value, but whereas those emotions come in violent bursts and are gone again, the gnawing ache of loss has to be simply endured. It's like background noise, it's always there, it never goes away. You just have to try to block it out, distract yourself, hope that tomorrow the hole they left behind has grown a little smaller.