<s>[INST] hi there,i took a single dose of 3500 mg of acetaminophen five or six days ago. since then, i started experiencing a pain on the right side of my ribcage, radiating to the stomach. its not so sharp, but its quite annoying and sometimes wakes me up at night. it also tends to hurt more when i dont eat.i also have an eating disorder. ive never been diagnosed, but its clear that somethings wrong. ive lost thirty pounds during the summer, but gained back ten since school started because of binging and purging multiple times a day. my bmi is about 18. ive had an endoscopy two months ago because of an eating disorder related accident where the toothbrush i used to make me purge slipped down my oesophagus. quite an uncommon thing, i know. since then, i seem to have a lot of stomach pains and heartburns.i was wondering if i should see someone.please excuse the mistakes i might have done, english isnt my mother tongue.and thanks for the answer! [/INST] Hello, Thanks for the query to Chat Doctor. Forum. If I were your treating doctor for this case I would up come up with the following advice as,1 Accidentally you took 3500 mg acetaminophen and stated experiencing pain in the right rib cage.First I want to clear that maximum you can 4000 mg (4 gm) of this Chat Doctor.  As in large single dose this may develop acute gastritis and all symptoms developed. Diagnosis can be confirmed by a physician by physical examination. Take antacid & if severe symptom take proton pump inhibitors. 2 Next reason of your problem is blunt injury in the esophagus due to toothbrush. As this developed esophagitis, this causes heart burn and stomach pain. Try raising the head of your bed about 4 inches with blocks. It might also help to avoid eating or  </s>