I get bad clotting too , it's like the chainsaw massacre sometimes , I went to my gynaecologist and he gave me transamic acid, which didn't help much then mefanamic acid which he said would make them lighter ....it's a strong anti imflamatory but it reduces flow but you have to take with food and eat really sporadically and they gave me an upset tummy, can't really take even ibrufen as it irritates my stomach but they definitely helped , I have taken norethisterone to stop them mid track a few times but as soon as you stop they gave me ( and when I googled lots of other people too) the period like a train crash after . But you can buy online from superdrug ( I think) and lloyds pharmacy xxx