Imho 16 mgs of bupe is way to high of a dose. Now I don't know how your body reacts to suboxone but when I was on it I was supose to be taking 24 mgs a day. I knew from previous experiences that 24mgs is wayy to high so I Took a split dose of 8mgs ( 4mg in the morning then 4mgs at night ) for a week and then realised that was perfect for me. I could of got away with just taking 4-6 mgs a day, and I would towards the end of the month. Anyways, what I'm trying to say is that you should try taking less for a few days or so and then take it from there. I ALWAYS felt better when I was taking the lowest dose that would hold me. Not sure if this helps you at all, just thought I'd share my year of suboxone use with ya.
Oh Yeah I forgot to mention this, but after being on sub for a month it did nothing for my cravings. So I was using H and other opiates on the weekends or when I'd run out. I'm currently on methadone, and have been on it for 4 months and I love it. It stops most cravings and I only need to dose once a day. It did take awhile to find a dose that held me for 24 hours but it was hella worth it. Since I've been on methadone I've only used h like 2 or 3 times,which for me is very good.