I'm going crazy without seeing you for even a second.
◆ Literal translation = たと123591 second でも Jun (きみkimi or ぁなた Anata) のが See ぇな.
※ Crazy ってしまぃそぅになる (crazy = can't control myself)
◆ Free translation =たと〧
※ However, the Japanese verb "crazy" sounds quite scary, as if this person is going to be a dangerous person, so the following sentence is more natural.