Been there done that.
What works best is first a Water Pik aimed directly at the area to wash away the recent rot

and then a spray bottle filled with mouthwash squirted right on the tooth and then swish and spit. That should hold you until tomorrow.
The tooth sounds like it is doomed but the sooner you have a dentist look at it the better it's chance of survival with a cap, root canal, etc.
If it MUST go, then have it pulled sooner rather than later. No sense swallowing all that decay bacteria...it really does begin to turn our stomachs, and think of the STRANGERS (and lovers

)who have to smell it.