Disconnect the new fog light wiring, and see if it stops blowing fuses.
If so, then you wired the fog lights wrong.
Diagrams can't help you, because they would not show the fog light wiring you added, and it appears there was no problem until then.
We would need to see a diagram of how the fog lights were supposed to be wired, and what you did instead.
If the fuses still blow even with the fog lights disconnected, than it was just a coincidence.
So then what you do is replace the fuse with a test light or flasher relay.
That will add enough resistance to prevent wires from melting, but will indicate when there is a short or not. When there is a short, light will be bright and flasher quick. When you disconnect the short, the light or flasher will dim or slow. Disconnect things until you narrow it down.