1997 "mercury sable" "Headlighs not working"

Hey hope some one else has an Idea. I have a 1997 "mercury sable"
and the headlights have bee nacting flacky I guess yo uwould call it.
Sometiems when I turn on the headlights the drivign lights come on but
the headligths don't. If I flash the High Beam a few times usualy the
lights would come back on and stay on while I'm driving. Tonight no
headlights at all. I can use the flash feature where I pull back on the
turn signal switch and the headlights come on but as soon as I release
it they go back off. Pushign forward no Hig hbeam and in the middle no
low beam. I tried swapping the relays under the hood (Well the ones in
the power distribution box) and checked all the fuses but still no
Headlights. Does anyone know where the headligth relay is acualy? Or
has anyone expieranced a similer problem. Teh car is stock with al lthe
factory frills but no acceseries and I can't find a lose connection or
blown fuse. Is the headlight relay some where else besides the fuse
block or power distribution box? I can't find any relay labbled
Headlights but could find the fuses. There is 1 10amp fuse in the dash
for each headlight. and advice would be appriciated before I take the
car in to a sho pand get ripped off like it seams happes with most
mechanics here in Fort Lauderdale, Florida. PS car does have a slow
drain where if the car sits for a few days the battery may have to be
jumped but takes about 4 or 5 days of being parked before it dies.