The phrase "to hell and back" is usually used to describe a difficult and trying experience. However, there are other phrases and expressions that can be used as alternatives to this phrase. One common synonym is "through thick and thin," which implies persevering despite hardships. Other options include "uphill battle" or "hard road," emphasizing the journey's challenges. "Trial by fire" also connotes a difficult experience that ultimately leads to growth or transformation. Finally, "living through a nightmare" captures the sense of dread and despair associated with going through a difficult ordeal. Overall, there are many ways to describe a tough experience, and using synonyms can add variety and nuance to one's language.