"Sweat it" is a common phrase used to describe someone who is worrying or stressing over something. However, there are multiple synonyms you can use instead of "sweat it" to add variation to your language and present a more professional and polished image. "Fretting", "agonizing", and "overthinking" are all synonyms you can use in place of "sweat it". You can also use phrases such as "tense up", "worrying excessively", or "over-obsessing" to describe someone who is stressed out. Using different synonyms for "sweat it" helps diversify your language and avoid repetition, making your communication more effective and engaging.