Shelley, some people are able to get away with fast tapers and others have to go through a more long drawn out taper process. I recently got off of subs after 4yrs of maintenance and my taper probably took about a year, I still went through the worse part of the withdrawal at about 3wks post sub.
Suboxone (bupe) just keeps building in your system, which is why people caution against even jumping at 2mg. While it's not going to continue to build if you're dropping your dose every three days, it's still going to take weeks for it to be fully excreted based on your previous dose range. I can only surmise that you'll likely feel worse than how you already feel. Then again you may have an easier time than others.
There are things you can do to lessen the withdrawal. As you already know, physical activity is tops. OTC loperamide will likely help, I personally used lomotil (which is another diarrhea med available by prescription because it's a control- contains an active opiate in a very small amount). You also might want to get your hands on some Kratom ( this helped far and away the best- especially for fatigue). It's always good to have a couple benzos for really rough days, but clonidine (which I think I recall you mentioning you already have in a different post) is probably a fair stand in.
Wishing you all the best!