Yes, it is difficult to totally wean off clonazepam. I mentioned that to you before.

Of all the benzos it binds very tightly to receptors. Some people take 6months or more to get off it completely. The serum half life for clonazepam is 18 to 50 HOURS. That means only 1/2 of the drug is gone within that time frame. So waiting 8hrs to drink is not wise, as you are getting a synergistic effect. This is why getting off this drug is very problematic. Also your age factors into this. Older people, have slower renal clearance of benzos, and for this reason the 1/2 life would be much longer. So the drug can build up in the body in elderly patients.

You need a careful SLOW taper. Klonopin makes wafers you can split to get to lower doses more easily.
http://www.drugs.com/imprints/1-8-1521.html
This photo is of the .125mg wafer.

I believe the clonazepam is masking your PN, and once off of it you will have much more pain for a while. Over time tolerance to this drug leads to higher doses to get relief...and becomes a vicious cycle.

There are websites devoted to benzodiazepine withdrawal, and all of them suggest very slow tapers (most doctors go too fast).

Melatonin is not going to work as it does not sit on GABA receptors.
Melatonin is only for sleep. It is not a tranquilizer. The inhibitory receptors benzos sit on, prevent excess firing and are rather unique.
You may find some suggestions for this on the benzo withdrawal sites.