How to ease my period while on vacation?

I've been in London/Paris for four days with my family and since I tend to have bad luck, of course I got it yesterday while we were on the train from London to Paris. I didn't see it coming because I have never had a regular period before. I never know when it's coming, but every time it's extremely heavy for the first three days. Anyways, day 1 is almost over and it hasn't gone well. I brought pads but it's so heavy that I need to change it every couple of hours and I just feel disgusting all of the time. It's been soaking through and ruining my clothes. And we have no laundry so I have to reuse my blood-soaked pants for the next two weeks until I return home. The blood also soaks though my pajamas every night and ruins the bed and it's really embarrassing because I'm with my family and I don't want them knowing. And I have no painkillers so i feel bloated all of the time and my stomach hurts too much to eat any delicious French food :( I hate this so much. Are there any ways to ease it? Any foods that will help reduce the blood flow? Natural remedies? Please give me suggestions