Hello @emilystewart30,
Welcome to Mayo Clinic Connect.
Connect is a place to give and share information, but it should not be used in place of your own medical doctors input. All we can do here on Connect is guess what is causing your chest pain, or chest discomfort.
My advice would be to make an appointment and head straight to your doctor, which you have already done and have an appointment. Yay!
It would be easy to say that at your age chest pain could be related to some other condition, but then again, we are not doctors and cannot order tests or labs or diagnose you from the online confines of Connect!
You have received that same wise advice from several other members.
Don't torture yourself with wondering what this could be...keep that appointment! Your appointment is this month, and time goes by so fast it will be here before you know it!
This is a brand new year, you are young, start it off with putting your health above all else and make healthy choices with diet and exercise. Sounds like you are healthy other than these nagging chest and GI issues. Your doctor will go over the results of your X-Rays, and if those are negative, they may order more tests to figure this out.
Hang in there and if the chest pain or GI issues become severe...get to a walk in clinic or Emergency Room.
Be sure to write this all down so you have it handy for your appointment. Keep it simple and succinct, and try to remember timeframes and any link to symptoms. Like it happens when I am sleeping, or when I am exercising, or random...things like that. Also mention when these symptoms all seem to start like you have done here on Connect. Do you have periods? Is there any correlation time frame wise?