Methadone Hydrochloride and clue

I'm not sure if this is a "new " side effect but I too get "hot flashes" ,Ya right more like being on fire! And I also have this pins and needles feeling over my entire body, it kinda washes over my body usually starting at my feet. The nausea is unbelievable. At first when this started to happen , it was about 3 months after I started taking the methadone when I stopped taking over 800mgs of morphine a day to keep the pain at bay,. Then I was taking 250 mgs of methadone. My doctor didn't have a clue what this was because it started so late. However now that I'm almost off of this crap I am in more pain than I care to deal with, so I'm not sure if the depression I feel is from the methadone or just me being frustrated over this.