5 gram of apap (paracetemol) in less than 24 hours? how dangerous?

Don't do it again: You took this in divided doses, i trust. This is a bit higher than the "safe dose" of no more than a gram every 4-6 hours, maximum 3 or 4 grams daily depending whose recommendation you read. You also know that 6 grams all at once can make you quite sick, and 10 grams or more at once can kill you. Do be careful and thanks for writing.