The phrase "feverish activity" means doing a lot of things quickly and urgently, as if you have a high fever and are in a rush.
Sentences with «feverish activity»
In any case the days of feverish activity in connection with that are over. (jacktworkov.com)
«That is why there is such feverish activity at the moment.» (the-blockchain.com)
But prayer itself centers in relaxed quietness — in the interruption of our own feverish activity that God may have a chance to act in us. (religion-online.org)