Gatsby's initial emotion is to have such a case of the jitters that he almost makes himslef sick.
"An hour later the front door opened nervously, and Gatsby, in a white flannel suit, silver shirt, and gold-colored tie, hurried in. He was pale, and there were dark signs of sleeplessness beneath his eyes."
Gatsby later is filled with both anticipation and dejection.
“Nobody’s coming to tea. It’s too late!” He looked at his watch as if there was some pressing demand on his time elsewhere. “I can’t wait all day.”
Fear:
"With his hands still in his coat pockets he stalked by me into the hall, turned sharply as if he were on a wire, and disappeared into the living-room."
Embarrassed:
He followed me wildly into the kitchen, closed the door, and whispered:
“Oh, God!” in a miserable way.
“What’s the matter?”
“This is a terrible mistake,” he said, shaking his head from side to side, “a terrible, terrible mistake.”
Mesmerized:
"I went in — after making every possible noise in the kitchen, short of pushing over the stove — but I don’t believe they heard a sound. They were sitting at either end of the couch, looking at each other as if some question had been asked, or was in the air, and every vestige of embarrassment was gone."
Ecstacy:
“It’s stopped raining.”
“Has it?” When he realized what I was talking about, that there were twinkle-bells of sunshine in the room, he smiled like a weather man, like an ecstatic patron of recurrent light, and repeated the news to Daisy. “What do you think of that? It’s stopped raining.”
Pure love:
As I watched him he adjusted himself a little, visibly. His hand took hold of hers, and as she said something low in his ear he turned toward her with a rush of emotion. I think that voice held him most, with its fluctuating, feverish warmth, because it couldn’t be over-dreamed — that voice was a deathless song.