Drill Bit Sharpener

Get an old large bit, 1/2" or larger and a new one you can look at for comparison. Make sure your stone is dressed to a flat face. Try to maintain the same angle that the bit had to begin with and keep the heel just very slightly deeper than the cutting edge. Do your sharpening above the centerline on the grinding wheel. (Which is usually above the tool rest as thy are approximately on center.) Make multiple light passes rather than a heavy grind and make the same number of passes on both cutting edges. Then keep trying until you get a grind that cuts well. It's difficult to get the correct angle on small bits until you are used to doing it on larger ones.
I've got a Drill Doctor but don't like it. I can do a better job faster with just my bench grinder. If the bit isn't indexed exactly in the Drill Doctor the bit won't cut.