Oil probably doesn't have the same downside risk as other sectors. They have already had a pretty good selloff. Some time last week one of the majors made headlines for their spending in the Artic I believe.
I think healthcare is still a pretty strong industry (Boomers still aging, immunotherapy having some good breakthroughs, FDA approving safe/effective drugs faster, Obamacare still spending money, insurance and pharma companies seeing quite a bit of M&A activity). That said, the next few weeks will be choppy at best as 'winners' are sold to balance the 'losers'.
Oil is risky in my mind. There is so much investment in wells that cost millions to drill right now that won't pay for themselves enough to break even unless oil is over $70/barrel. At sub-$40 right now, they're hemorrhaging. While eventually it will come back, a substantial slowdown in consumption caused by a weak Chinese economy (second largest consumer of oil in the world) will hold prices low for a while; perhaps a very long while if this is a longer event.
Traditionally, the safer stuff is the stuff no one can live without, stuff like your supermarket and discount store stocks. That said, right now I think the airlines are benefiting from all this cheap oil, as fares haven't really changed that much since oil was three times its current price.
I'm a pretty lazy investor. I freak out at the big drops (although not with with one, yet), but generally keep a conservative portfolio. I'm a little over a decade from retirement, so I'm not super worried about the normal fluctuations, but I'll be honest, 2008-2009 freaked me out!
And besides, this is not a sign of the apocalypse:

People still want to buy right now, enough that this morning made a lot of people very, very rich after the morning sell off.