I find that amitriptyline works best for me when its combined with one or two other drugs, a cocktail so to speak. By itself its sort of shitty(for me, your mileage may vary). When I take it combined with opiates, it works great. If I stack it right with benzodiazepines, it works pretty good. Now if I go Lyrica, amitriptyline and say oxycodone, its the shit. I don't really get that hit or miss problem because I don't take it often enough for it to fade in and out.
I really would like to find out the absolute best way to use it and get the most out of it.