I was referred to an endo for "#19 has an existing RCT". If I'm correct, that means I have an infected root canal. Now that tooth has been infected for maybe 7 years...

I don't feel any pain there so I never took care of it but I wonder if it's possible that it's causing me physical illnesses in other parts of my body? I've had years of unexplained headaches, depression, anxiety, fatigue, insomnia. Is it really possible?

Also, what is my best course of action here? Do I re-do the root canal or is pulling the tooth better?

Thank you