I'm On The Second Day Of My Period, And I

I'm on the second day of my period, and I have been experiencing strange, new symptoms since the first day. My cramps were fairly bad on the first day, and I felt nauseous, dizzy, and very weak. I also have been experiencing frequent diarrhea, which has never happened. These symptoms were not present before I started my period, and started the day of. I've lost my appetite, and at one point, while getting water, I blacked out. My vision got blurry, and I could hardly see a thing. My ears were ringing and I had to sit down and wait it out. I'm very scared, and not sure if there is an underlying problem. I'm also quite young, and to go to a doctor, I must have my parents come with. I am 15. I told my mother these things, but she said it was normal. I'd feel so much better with a confirmation that these things are normal, and I simply need to drink more or eat more. This second day has been much better, but I still have diarrhea. I am not sure what to do or think at this point. Please help!