Sounds like a bad switch. If you have the daytime running lights function switched off, try turning it on. To the lower left or right of the headlight switch you'll see what looks like a very small slotted screw. This is the switch to turn on the DRL function. Find a small screwdriver and turn it. If the lights come on you're probably ok.

It's just an idea but it might get you by until you replace the switch if that's what's failed.

FWIW I use the DRL this time of year as it's usually overcast or dark but in summer I turn them off and control the lights manually.

Good luck,
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Erwin in Memphis, '88 745t 190,000 miles, '95 855t 92,000 miles