Post mastectomy drains

Hi all. I see there is some discussion 5 years ago on this matter. Wonder if anyone has any recent experience or advice. I am 7 days after mastectomy. My drain was showing 100 ml today ( it was 60 yesterday).  My breast nurse advised me not to shower yet. I'm feeling grotty, still having pain and discomfort.  I'm told it has to go down to 30ml before it is removed. Anyone any advice ,?