Fog Light Switch problems of the 2000 Subaru Outback

Unknown component part/system. Drivers side headlight went out. Checked fuse and bulb which was still good; replaced bulb anyway and it still didn't work. Next day the other headlight also went out. Checked the same things. High beams, fog and parking lights still worked. My son jiggled the bulb socket and wires and the lights came on but now the driver high beam went out. High beam bulb and fuse were both okay. The low beams also now appeared to be yellow. Had to drive at night a few days later (I always drive with my fog lights on unless the high beams are used) and it seemed like I could not see virtually anything ahead of me; the low beams were extremely dim and unsafe to use. Was forced to use my single working high beam. In googling the problems online I came across scores of other people with similar problems. Some replaced the drl module with no change in result. It has to be a socket problem or grounding problem of some sort, or perhaps a wiring problem, though some people replaced the wiring harness to no avail, and replaced pins, clips in the bulb socket assembly. This is dangerous.