It will be pretty hard to get that fixed on the road, especially on a Sunday. You have to decide if it is safe to drive. I would make sure the wipers work and the brake lights work. Drive during daylight only. From what you said you should be able to make it home. Do you have those old type ceramic fuses? Could be a bad ground but could also be something on the positive side. Without the schematic it is hard to say what is common between the things you list. Maybe someone else will have a better answer.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra