He feels elated, he feels nice seeing the people around him and thinking how better he is than them.
At the same time, he seeps into thinking the use of it, him being better. All in vain. No efforts to recognise it nor any recognition. Feels sad....
He drinks two cups of coffee back to back and get on with work. He is not sure if it was the coffee or it is just him.... he continues being sure that it is not the former one....