Rapid heart beating, lightheaded, 15 years old!?

I was drinking with friends and fell asleep later (didnt drink that much) and whenever i would get to sleep my heart wold beat really fast, like an anxiety attack (happened bout 10 times) that was friday night. I had another one last night but barely just was really focused on breath i think i was imagining it. But now im lightheaded and weak and idk why. i dont want to go to the doctor for a blood test or anything cause then theyll find sstuff in my system and itll break my moms heart. what should i do? It might be anxiety, my mom thought it was a chemical reaction cause i had alot of pop and sugar. OH also i was thinking about diabetes while i was having the first "attack" cause id been eating realy unhealthily and id had a diabetes symptom dehydration and peeing alot. I had 12 water bottles in 24 hours...but im not overweight and generally am pretty healthy. my mom was helping me through my second attack of whatever and im just worried. doctors is not an option.