I got some "white blood " from a cactus in my mouth , and now my lips , tongue , and throat are burning. Not bad , but its not going away. Am I going to die ?

Are you sure it was a cactus and not this plant?

http://forums.botanicalgarden.ubc.ca/data/attachments/36/36033-294fc29673c89f0080fd3f82d19316fd.jpg

This is an African milk tree and often confused for a cactus, but it's white sap isn't harmful but is an irritant. Cacti don't have a white sap.

Cactus sap causing Burning & Blistering | UBC Botanical Garden Forums (http://forums.botanicalgarden.ubc.ca/threads/cactus-sap-causing-burning-blistering.40164/)

Maybe the emergency room or your private doctor should be seen to be on the safe side.