Nidge
This is a good question, the steroid regime during docetaxel chemo is normally intermittent for periods either side of chemo until chemo ends and then stop completely. The steroid withdrawal issues should not be an issue for that type of usage.
However if in doubt check with your GP.
The fatigue may just be HT related or the fact that chemo itself has left you tired, maybe your Hb and WBC blood counts are still recovering.?
The gradual withdrawal from steroids is usually done for people who have high dose long term treatment with them.
Best wishes
Xxx
Mo