Ways of arguing in British and American English

Can you tell me whether such parts of exchanges (talk) sound natural, more natural in the UK or the USA or do not sound natural to you? I would like to introduce a more colloquial way of speaking in everyday situations, like a brief argument between relatives, for example. Can you give more options for British and American usage if you think appropriate?

1. Looks like my wife and I are at it again, arguing (bickering) over the smallest, silliest stuff. (things). It’s (really ) wearing us out. We should probably channel (turn) our energy into something more worthwhile. (valuable).

2. Seems my wife and I are at it again, squabbling over the tiniest, daftest things. It’s truly knackered us. We ought to direct our energy towards something more constructive.

svetlana14 said:

It’s truly knackered us.

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This bit's no good.

In AmE we do not use knackered as slang for tired or exhausted.