Hi there ~ I understand your concerns. Overdose on paracetamol is concerning. I hope you have consulted a physician regarding the same and are following up with the same person regularly to get yourself treated for this condition. I believe that you should also not be taking anything that would affect your gastric mucosa like aspirin, and hence I would advise you to consult a doctor so as to find out what is going on after giving the doctor a complete history and get a physical examination, lab testing as well as any imaging study needed to confirm your diagnosis. Over the counter medications to symptomatically help till you visit your doctor may be an alternative. I hope this helps. Take care and have a lovely day!