The phrase "most belly aching" is an expression used to describe someone who complains excessively or is overly dramatic about minor issues. There are several synonyms that can be used to convey the same meaning, such as "whining," "complaining," "grumbling," "fussing," "moaning," "bickering," and "griping." These words are often used to describe someone who is overly negative or pessimistic and focuses on the negative aspects rather than the positives. While it's important to voice concerns and complaints, it's also important to maintain a positive attitude and focus on finding solutions rather than dwelling on problems.