can't handle it, can't manage
Não dou conta de tanto trabalho ao mesmo tempo.
I can't handle so much work at once.
This is a transparent, literal phrase rather than a colourful idiom. Dar conta de means "to account for" or "to be equal to" a task — to handle it successfully. Negated as não dar conta, it simply says you cannot manage or keep up, that the job is beyond you.
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