acts on the normal circadian or biological rhythm in the body as opposed to zopiclone
. It is useful in night shift workers. Melatonin does not give you the same effect that zopiclone does, that could be one of the reasons that you feel worse now. It does have a few side effects like headache, drowsiness
etc. Since you have recently started taking the drug, give it some time. If the side effects lasts long then go back to your psychiatrist
for a solution.
Hope this helps,
Dr A Rao