Gently steel wool off the rust (unless you like the taste.LOL)and use it until you get a replacement. It will rust over quickly unless you apply oil to the clean metal. The enamel repair paints and kits are for cook-top surfaces and tubs and the like. I wouldn't trust them on a cooking pot.
The worst that can happen is a little more of the enamel (glass) may flake off, but will settle out quickly. The spot will eventually rust through so do replace it when convenient.
bosco