How to say someone on the phone my tears just overflowed when that person says something funny and I burst out laughing. How to say that person I'm laughing and crying at the same time?

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I would say: " I am laughing so hard right now that I'm crying".

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- "I am crying tears of joy!"

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Hi Ali! 
you could say "I'm laughing so hard that my tears are coming out"

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Hey there Ali, I would say that "I'm laughing so hard that my tears are even coming out" or "I'm laughing so hard that my eyes are even teary".

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Hello Ali. You have actually explained it really well :)