This is all about your and and Klaus’s love. You and him have been I love when you both were humans, you were turned into a vampire with them, you and Klaus are each other soft spots. In this just shows old romance memories of you and Klaus because Klaus is missing and no one can find him anywhere, meanwhile you are lying in his and yours shared bed with a werewolf bite and since you keep going In and out of consciousness you keep getting memories of your and his romance over the 1000+ years you and him have been together. And only Klaus’s blood is the only thing that can heal any werewolf bite.