Hi. Thanks for your query. Noted the history about a 20 year old, it s about a year since you stopped puking after eating. Since you are bulimic, you have started puking up again, about twice a day, but today stomach feels funny, like empty, but it hurts too, like a sore feeling you work out a lot, wants to know what does that mean, whether acid working attacks. My thoughts and advise: Since you are bulimic, such things ought to occur. Hence the basic treatment is to take an opinion of a Psychiatrist to have the treatment for your bulimia and if the medical treatment fails, please consult a Surgical Gastroenterologist, or a Medical Gastroenterologist to for further management . The puking will stop by eating small frequent meals. Avoid oily and spicy foods. You will have to control the problem of bulimia, it is possible. Also take a PPI and see if there is some relief, if it is present, please continue and have an upper GI Endoscopy to see what the problem is.