Hi - yes I have this too. Have had it for several years now, getting worse and worse. Now I am bleeding continuously, ridiculously heavy for about a week and a half out of every four - bleed for the other weeks too, just not as heavily. It it now at the stage that I do not leave the house if at all possible for that week and a half. I struggle in to work, with about five changes of bottom half clothes (all black obviously!), and change clothes several times during the day. I need to go to the loo and change about 3 times an hour or it is running down my legs - literally, flows down like I am weeing blood... sometimes I end up just sitting on the loo for an hour (or just stay standing in the shower), I am losing so much, including many big clots (some of them up to the size of an orange), that there is no point getting off..two minutes and I'll have flooded again and be back there. My friends cannot believe me when I tell them how much I lose, DH does because when I am really feeling dreadful after several days of it and am cleaning the floor/toilet/myself up for the umpteenth time that day and have been about to pass out, he has had to come in and help me and makes jokes about chainsaw massacre to try and lighten the situation!
I keep getting taken into hospital for iron/blood transfusions as it now takes me two months to go from normal iron levels to severe anaemia...It has got this bad gradually over about 6 years, so I think I have just got used to it and learned how to cope as I have gone along and it is now second nature to have spare clothes in the car, to watch the time all the time, so that I am monitoring how long before I need to be back in the loo again, I work and I have children, you just have to keep on going... I know what mine is caused by.. I have fibroids - my uterus is now the size of a 5 month pregnancy.... my GP has now said that I need to Urgently have a hysterectomy. A hysterectomy has been on the cards for a while (obviously), but I have been putting it off because I don't know how I am going to cope with the children and work whilst laid up (no family to help, friends all work etc), but it has now got to the stage that I will end up in hospital for Iron infusions every month and they are running out of veins to use (they had to go and get a chemo nurse last time to get the IV in as the other nurses weren't able to) which is going to be a nightmare logistics wise (it takes 7 hours to do IV and hospital is an hour away.. that means at least 9 hours out, childcare only runs 9 hours a day, therefore DH has to take time off work to do pick ups etc plus I have to have the day off work). I am now waiting for appoint with Gynae, so can get it all set up, I don't know how quick "Urgent" is though and how long it will take to get it all booked in.
Anyway, sorry, very long reply there, but what I was trying to say, is yes I do understand how you feel... it is crap... but it can be caused by something like fibroids, which are not bad themselves, they are just a total pain in the arse if they cause all the bleeding. I have tried Tranexamic acid, I found it just held the bleeding off for a few hours whilst they were in my system, as soon as the levels started to drop I lost all the blood that they had been holding off, so had a huge flood, plus worse than normal cramps whilst my uterus was trying to get rid of it all. So I stopped taking them.
Practical wise - wear lots of black, take spare clothes with you, leggings fold up small, easy to carry in a bag, wear long t-shirts dresses that cover your bum/tops of your legs, take plastic bags to put your used clothes in... use tampons and sanitary towels together, when you go out or maternity pads...don't wear lace up shoes (difficult to take on and off in a public toilet when changing your clothes), plastic bag or towel on seat of your car etc... all stuff I am sure you have already thought off..
The Gynae will want to know the pattern of your bleeding, so if you have it in a diary, what days your were heavy, how long for, how many times you changing tampons etc, then get it all written down to take with you on weds rather than them sending you away for another few months to fill out a diary. If you are bleeding this heavily, are you tired? - you may be anaemic, maybe ask for a blood test, if you are anaemic, it not only affects your energy, it also affects your pain threshold and your ability to cope, when I am low, I get very weepy and down. The bleeding gets me down a hell of a lot anyway, but when my iron is low it is even harder to mentally cope with it. I hope it goes well for you on weds and you get some answers of what is going on!! In the meantime, lots of sympathy from here too... men have it bloody easy!