How to reuse working proxies and put account again when script error (or proxy failed)

[nothinq]

Hello everyone,
I have some problems, i'm newbie on BAS.
I read a list accounts from database, and a list proxy

1. How can I reuse the proxy when it working (because many proxy not working, so when I have a proxy worked, I want reuse it for next account) ?
2. When some condition happen, I want re handle current account and change proxy (example when a IP being spam, and met captcha, i want program not skip current account, just change new proxy. Otherwise, proxy not changed (question 1)

Sorry for my bad english