According to the data you provided (stuttering and difficulty telling words to the point of yelling), it seems likely that your child might be experiencing verbal non-fluency. It is a term that covers a lot of speech disorders.
Since there are many different speech disorders, you might want to visit an Ear, Nose and Throat specialist to rule out possible laryngeal causes. If none is found, you might want to visit a specialist in phoniatrics, who might be able to exactly determine the speech disorder and put the child under further treatment.
Please note that the child might have no actual speech disorder and it might be a psychological way to show an exposure to stress. Big expectations from your child might result in resistance to learning new things or improving skills, such as fluent speech. If the specialist in phoniatrics finds no speech disorder, then you might want to visit a pediatrician specializing in children’s development and psychology in order to check if the condition is the child’s answer to the events that surround him or her.
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