these symptoms varied with the seasons , as shown by a brief examination of the `` symptom lists '' he kept : spring vomiting diarrhea cramps dry mouth shortness of breath violent mood swings summer dizziness blurred vision shivering profuse sweating excessive salivating violent mood swings fall vomiting diarrhea cramps violent mood swings winter delirium blurred vision nausea violent mood swings duncan was convinced he had contracted these symptoms as a result of his encounter with the machine .