I have had similar symptoms from stress somatization at times of high anxiety in mixed episodes. Firstly minor physical discomfort starts like the expressions "pain in the neck", "sick to the stomach", "pain in the ***" acid reflux, nausea, digestive and bowel promblems worsen as time pass's. The body needs sleep to recover and for organs to function so after extended lack of sleep, vomitting becomes only dry retching from loss of appetite, inflamed throat and swollen neck, severe stomach pains i wont even explain what happens at the exit valve. After numerous ultra sounds ct scans 2endoscopy and 2colonoscopy dozens of blood tests not one doctor could explain what was causing it the first time it happened. I lost 28 kg in less than 3months. It was only after this that my doctor asked if i had been feeling stressed anxious or having trouble sleeping at the time and referred me to a mental health specialist and i was diagnosied with bipolar.