The expression "going through the roof" is commonly used to describe a sharp increase in something, whether it be emotions, prices or something else. There are many synonyms for this phrase including skyrocketing, soaring, surging, spiking, escalating, and exploding. These words convey a strong sense of growth and momentum that is often associated with the sudden rise of something. Other words that can be used to convey the same meaning include booming, flourishing, thriving, flourishing, and prospering. Overall, these synonyms help to paint a vivid picture of a strong and unrelenting upward trend in something, whether it be good or bad.