14months old temper tantrums😫😫

My daughter has always been the calmest and sweetest baby ever. Everyone was telling me how lucky I was to have such an easy baby. It even encouraged us to have another one so that she will have a bff. I’m currently 20weeks pregnant but I’m desperate, I don’t know how to handle her tantrums. It started last week, when she doesn’t get what she wants, she will cry, not soft cry, but an alarming cry, like screaming super loud. No matter what I do, she won’t calm down, the only thing that works is peppa pig but we want to cut off screen time. Her father tells me to let her cry in her crib, that it will pass but if we get her used to watch videos on YouTube whenever she cries, she will start to manipulate us with her tantrums . But it breaks my heart , even when I hold her it doesn’t change anything. What can I do at this point? I’m exhausted and super anxious about the future like how am I going to be able to deal with two under two😭😭😭