Lost one of my twins 😢😢😢

I just came from the doctors and she told me she couldn't find a heartbeat on one of my twins. I'm devastated, she told me that now I'm at a higher risk for miscarriage with my other twin now. They were identical so shared the same blood line. Have any of you mommas gone through anything like this before? I'm terrified I'm going to lose my other baby girl.