After I reset my Linode account password, I have been forward to Billing page continuously

Solved. Reset the web browser (FireFox in my case) can solve the problem.

I'm happy to see that you were able to resolve this. While I hope this doesn't happen again, but if it does, could you send any screen shots or log information you could in a Support ticket, or by email to support@linode.com? (assuming you're unable to get to the Get Help section of Linode Manager). Information like this could help us investigate what was happening, though it sounds like possibly a browser cache issue here.