How to remain calm when autistic son is displaying challenging behaviour

I struggle to remain calm when my autistic son of 7 displays challenging behaviour. I know that this doesn’t help the situation but the only way in which I can get him to listen during these times is to raise my voice so that he hears me above all of his thoughts etc. This only escalates the situation further. During these times he will shout, disobey clear instructions and has started to show signs that he will hit us as parents although this hasn’t been to hurt. 

Does anyone have any suggestions to help me help him in this situation? Has anyone else felt like this before and will share what they have done themselves? Thanks in advance. 

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