HELP! I think somethings wrong??

So, I started my period the other day, and usually it isn’t like super bad but this time was different. I’ve been super dizzy even though I’ve been eating and drinking plenty of water. During my dizzy spells, sometimes my vision will get dark around the edges or it all goes just straight up black for a moment. It’s also been bad enough to where I’ve had it sit down or I’ve fallen to my knees/hands/etc. I’ve had more/larger blood clots pass through (varying from about the size of a dime to a little larger than a quarter), and I’ve been bleeding straight through my tampons in 1-2 hours (they’re super strength tampons) which has never happened to me before. My flow was so heavy it leaked through my jeans and I ended up having to go home because of it (thankfully no body saw, but still). I’ve also been in a LOT more pain than usual, especially in my lower back. I tried talking to my mom about it, but she kind of just brushed me off saying to go lay down for a little bit and that I’ll be fine. Am I overreacting? Because like I said this is NOT normal for me and I’m getting freaked out about it!