Drinking fifth a day for tree weeks. I know its not advised but would withdrawl symptoms be severe after three weeks? History of cirrhosis and alcohol

Withdrawals. With a history of cirrhosis and that much recent alcohol ingestion, you are right in being worried that alcohol withdrawals could be difficult. It is obvious that you need to stop, of course. However, I would speak with your doctor ASAP about how to do that. Good for you for reaching out for help. Important for you to follow through now.