A good description of the symptoms are given in the articles given in this message.
The typical symptoms of fructose sensitivity are the same as any functional gut disorder. These disorders have been classified into entities such as "irritable bowel syndrome" (IBS), "functional diarrhea," "functional bloating," and "functional dyspepsia" according to the symptom complex. While the definition of such syndromes is useful in the design of clinical trials, they are somewhat artificial as their overlap is considerable and they are all believed to involve similar mechanisms of visceral hypersensitivity and disorders of the gut-brain axis. Functional gut disorder symptoms include such things as bloating, abdominal distension, discomfort, pain, and altered bowel habits.
Studies in which fructose loads are given to people with fructose malabsorption induce gas, bloating, abdominal discomfort, nausea, and disturbed bowel function much more readily in subjects with IBS than in those without it.
In summary, symptoms from a variety of functional gut disorders can overlap significantly. The only way to determine if fructose sensitivity is part of your IBS functional gut disorder complex is to eliminate high fructose foods and other short chained carbohydrates sorbitol and lactose from your diet for a few weeks and see if your symptoms improve. If they do then you have another tool to manage your IBS. If they don't then you move on to trying other management approaches.
-------------------- STABLE: ♂, IBS-D 50+ years - Science of IBS