Was on methadone for 6 years. 60 mgs the last year. Have been on 16 mgs a day of subs for almost 7 weeks. Still having pain. I feel like I weigh 500 extra lbs. Not sleepy, just physically feel heavy and I tire out very quickly. I've tried lowering my dose and raising my dose. Same results. I feel like I can't do anything. Infact, I don't do much of anything. I always feel so bad. I still have anxiety and for the past 5 days I've had horrible headaches. I don't understand what's going on? It seems like I'm the only person that isn't doing really great on it.