How long did you take to drop the Ambien? This might be caused by withdrawal from Ambien and not the Lunesta.

Second, typical Lunesta dosage starts at 1mg and is increased as needed to a therapeutic level.

It is suggested to gradually taper off of it because the withdrawal effects can be quite nasty - two of which are insomnia and fatigue. If you've been on it for many, many years, that tapering down can require a very long time and be done very gradually. Your physician should be able to provide a plan and and provide alternative dosages to assist. May also be able to split tablets to get lower doses a tapering approach would require.

I have tapered off of Ambien myself - it's neither easy nor quick.

I'm currently working on tapering off a different sleep med and am tapering by reducing the dosage by splitting tablets.

Hope this helps.