Pale noses, gums, not socializing, eating all are not good signs. A complete blood work up can show/tell allot.
These above symptoms brought us to the vet.

My experience with this dreaded disease is our sweet RB Butterscotch got very ill (RB Butterscotch) on a Saturday, had blood workup and on that Monday he got steriod shot. He got 1 dose of each (steriod/antibotic)Tuesday early a.m. and he was gone early that afternoon to the RB Bridge.

While some of our furry kids do well for years after first being diagnoised others like RB Butterscotch went quickly after being diagnoised.

I will keep good thoughts that your outcome is a good one.