Which side is it in? Acetaminophen can cause liver damage, especially if over used or used forlong periods of time. 6,000 mg is a HIGH dosage. Way more than what is recommended. If the pain continue, you NEED to see a doctor ASAP.
I agree 6,000 mg of acetaminophen is way too much for a single daily does. Alcohol even in small amounts with acetaminophen can be deadly. Stop taking it right away and as a precaution see your doc and ask for a CBC and liver function test.
Take care.
Go see a doctor a get tested pronto, you might be destroying your liver.