Lost my rainbow baby

Last week I went in for an ultrasound only to be told my baby no longer had a heartbeat. I had already suffered a miscarriage in October 2017 and am now having to go through this again. I'm angry, sad, and hopeless. I feel as though I've let everyone down even though I know it isn't my fault. I have a 5 year old so I have been through a healthy pregnancy. I just don't know how to have hope that I will finally get my rainbow.