Help! Bleeding too much?

24y/o I had like a period or two earlier this year then started missing periods all year until last month I had a period that was short like they always normally are (this was the first time I ever missed periods but I didn't think anything of it). NOW, I've had a period going on 11 days and it won't stop being super heavy flow. I never had real heavy flow but I'm soaking through tampons within 10 minutes and leaking right away so I've swapped to pads quickly (even now late in the period I'm bleeding this much). This has been acompanied by large (half dollar and bigger like today was about the size of two half dollar) blood clots all week. Yesterday I felt so light headed I almost fainted or felt like I'd have a siezure while in Hardee's and had to be helped to the car and slept the rest of the day, today I've also felt so not myself. What's wrong?! I'm a houseless traveler and I seriously don't even want to go to a doctor or anything.