Hello! Thank you for the query. As the brain can control whole human body, every panic attack involves intestines and can cause increased stomach acid secretion (heartburn and white spots in the throat due to inflammation caused by acid), more often bowels movements (lower abdominal pain and loose stools). You are a very young person and serious diseases at your age are very rare. As stress could cause peptic ulcers, I suggest you to have upper GI endoscopy with Helicobacter Pylori test performed. You should also have stool tests to see if there is no parasites or pathological bacteria s which can trigger an anxiety. Blood work, thyroid tests, ions levels (Magnesium, Calcium,) should be checked as well. Heart condition should be also checked with heart ECG and Holters 24 hours ECG. If all this tests will be negative, you may be suffering from IBS. Some parts of this diseases are caused by severe intestinal infections. That is why it is worth to try Rifaximine treatment. You should also get prescribed with Mebeverine and start anti anxiety treatment (Sertaline should be helpful, but after a psychological consult). Physical activity should be also increased to prevent your brain from focusing on the anxiety. You should avoid coffee, and start Magnesium 400 mg a day supplementation. Hope this will help. Regards.