that sounds awful for you, I know about the flooding and its bloody awful ,(pardon the pun). At my heaviest I wear a super tampon and a nighttime pad, during the day.
if you are meant to be post menapausal then maybe a trip to a good gynaecologist might help. Bleeding that heavy can lead to anaemia, which makes you feel run down and tired. It cant hurt to get an expert opinion as you sound, rightly,feedup with it all Fay.
This being a woman thing can be pretty crappy at times