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Ok.
Some basic pointers: don't think about harmonising each and every note. Harmony doesn't usually change with every note of the melody. Try and see what harmonic rhythm is being dictated by the melody. Remember than you can have passing notes, and appogiaturas etc. in the melody -- don't harmony note by note. Probably think in bars, and half bars, and maybe occasionally the harmony can change faster.
Keep the bass part fairly simple for now.
You seem to be harmonising just by trying to fit the best consonant chord to each melody note -- try to be very conscious of the progression of harmony - play out each chord change, and make sure it's strong. (I say chord because you must be implying a chord with your bass and melody).
As for the Db, like I said, an F could work below, so could a D, a Gb, a G, an A,....
Certainly, in C major, Db implies a Db F Ab chord, but you needn't be restricted to standard tonal progressions. The A before the Db almost rules out a Db major chord.
By the way, watch that the rhythm of your bass-line doesn't 'denature' the 6/8 rhythm in the places where 6/8 is meant strongly to be felt.
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