The story of my life 🤦🏾‍♀️....

So Im 14 years old and My period has always been a problem for me like it was normal 4-5 days then thats when it would be 7-8days so I told my doctor and she said its just your body changing it will soon go back to being normal So my last straw was when i got my period on Christmas eve *I also just started birth control to help with my period too* since then my period has been on its been about 2 weeks since my period has been on and im so tired of it one day its light and i think its about to end and then it come in heavy I’ve talked to my mom about it and she said she’ll call the adolescent obgyn/Gyno but still what do i do have any of yall had this problem P.S since this all started I’ve been really tired not wanting to eat basically not having an appetite also i get bad cramps and really hard time going to the bathroom