What is Daniel mourning about in Daniel 10:2?

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(KJV) Daniel 10:1-5

1 In the third year of Cyrus king of Persia a thing was revealed unto Daniel, whose name was called Belteshazzar; and the thing was true, but the time appointed was long: and he understood the thing, and had understanding of the vision. 2 In those days I Daniel was mourning three full weeks. 3 I ate no pleasant bread, neither came flesh nor wine in my mouth, neither did I anoint myself at all, till three whole weeks were fulfilled. 4 And in the four and twentieth day of the first month, as I was by the side of the great river, which is Hiddekel; 5 Then I lifted up mine eyes, and looked, and behold a certain man clothed in linen, whose loins were girded with fine gold of Uphaz:

Is Daniel here mourning about what he is about to be shown or what he had already been shown in the previous chapters?