He's obviously quite clearly bipolar and swings between manic excitement and ghastly self-doubt.
2.
Yevgeny Yevtushenko, the Russian poet and world traveler, brimmed with manic excitement, inspired to near-rhapsodic joy as he beheld the land that is his latest muse.
3.
In 1851 he published an article describing a condition he called " la folie circulaire " ( circular insanity ), of which a patient would experience cycles of manic excitement and cycles of depression.