Ugh why me

So on dec 15 2015 I had a stillborn at 35 weeks I'm soooooo depressed and don't understand why when and what happened to my baby within a weeks time frame went from a strong heartbeat to nothing it's hurts so bad I'm down constantly crying not understanding I'm 27 I have children but I had been TTC for 4 yrs after giving birth to my twins just for my pregnancy to be a fail I want to try again me and my husband but I'm more afraid of not only getting pregnant and failing again but I'm afraid that I won't get pregnant no time soon plz help what should I do.........