Temporary Filling of Root Canal Came Out. in Pain What to Do?

Since the tooth has broken off at the gumline, you may be at risk of losing the tooth altogether because there may not be enough tooth surface left to build a crown on top of.  With pain and swelling, you should get to a dentist sooner rather than later.  You have an open access for bacteria to enter your blood stream, and this can be quite dangerous.  Even if money is an issue, this is something that cannot be ignored.  Consequences could be severe.

The pain is due to the fact that the tooth became reinfected.  If your dentist feels that there is enough of a root left to be restored, then the root canal will have to be redone.  Otherwise, an extraction is in order.