clonidine was a game changer for me when I had to withstand droughts or just being too broke to get my fix. Its used for high blood pressure, but one of its off-label
uses, is that it REALLY helps with the fucking heebie-jeebies you get when kicking. It will not help with sleep, but it definitely calms you and also takes the hot/cold flashes away.
That has been my experience. Yes, you need a script to procure it. If you are able to get any...DO NOT TAKE MORE than what the script advises. More is not more in this case.
It works against you if you try to eat them like M&Ms' (like I did my first go round). You really only get relief the longer you space out taking the pills. Clonidine and Neurontin
got me through some rough kicks.