Crying, screaming, anger: in the early years, children do not yet know how to regulate their emotions. It's not about disobedience or whims, it's the normal growth trend. Staying close, naming what they feel (“you are angry”, “you are disappointed”) and offering contact helps to manage the crisis with communication. With this approach, even parents can improve their ability to manage emotions, thus interrupting the vicious cycle of stress and conflict.
More than 'calm', it is necessary to contain: to be present, to breathe together, not to punish. Emotions are learned to manage by living experiences of welcome and security. If the seizures become very intense or frequent, you can ask for psychological support at counselors or parenting centers.