Can I get decompression sickness (DCS) from flying after diving?

Yes, you can get what is called altitude decompression sickness, which is caused by the pressure change of flying at altitude and can be brought on if a diver flies too soon after having been diving, even at altitudes as low as 1500 m (5000 feet).  This is because any nitrogen bubbles that might be left in the body have not had adequate time to dissolve after diving.  This is especially true if a diver has been deep diving or altitude diving.