Convulsive intelligence

Is human intelligence just a human's illusion? Does human intelligence only help to remedy problems it creates, and to explain hypotheses it invents? Human intelligence produced modern medicine, helping people to survive after injuries from wars and car accidents; helping to cure cancer and depression, created by stress and anxiety; helping to cure auto-immune diseases coming from poluted environment; helping to correct problematic eyesight from staring too much at computer and TV screens. Does human mind just investigates a universe itself creates? Without theories of big bangs, would we need to search for signs of it? Is human intelligence convulsive?