Hi kazzak21,
I, too, am sorry you have needed to research PN.
Yet, I know from experience, the PN forum here is outstanding and is a great place to reach out, if needed.
Glenntaj has written a comprehensive response.
I am just popping in to say hi and welcome to NT.
I hope you find the information and support needed to sort out your current health challenge.
Warmly,
DejaVu