Has anyone done any blood work or EKG on you in the past year? If so what were the results of those? You can always request your labs from your Doctors office if you need to. I am not a Doctor of course but really don't think you are having heart problems but always say it is better to be safe and make sure.
So with that out of the way....Yes GERD can cause some God awful issues including everything you have described. If it makes you feel any better at all I can't tell you how many emergency room trips I have taken because I was sure I must be having a heart attack. Eventually I was diagnosed with GERD along with some other gastro issues. It is very normal to have chest pains, back pains, burning etc etc
You aren't alone in the way you feel at all. Gastro issues can play very heavily on your emotional state and it becomes very frightening and for some leads to anxiety issues and stress (sometimes it is stress and anxiety that caused GERD in the first place), which only elevates the GERD problems. What I would recommend first is asking your parents to take you to a gastroenterologist. Ask them to read your post here and they can read mine as well if you want them to. Don't be afraid to show them or talk to them about this.
To help alleviate your problems if this is GERD:
Take your medicine everyday!If you can't knock it out sometimes you can take a pepcid, have some maalox, or even tums on top of your Omeprazole. Some folks have to switch meds because one type stops working. There are many other varieties out there.
Next, this is going to be tough at your age but you need to be very aware of your diet. Avoid acidic foods like tomato based products ie pasta sauce, pizza sauce, citric fruits and juices. Avoid really fatty greasy foods, fried, pepperoni, chips etc. Try lean meats only for awhile, chicken fish or get your protein with eggs, nuts, veggies instead. No chocolate, no sodas, no caffeine and sometimes even milk can be a bad thing because it causes extra mucous which can irritate as well. Sometimes apple juice is a good drink to have since you can't have a lot of other things, it has pectin in it which can help coat the stomach. Start writing down what you have eaten everyday and note when your GERD seems worse with certain foods, and then try avoiding those.
Get yourself some concrete blocks or a bunch of books and prop your head board up. You need to get it elevated about 6 to 8 inches at least. If your parents will listen you can have them buy you some plastic bed risers that will do the trick. Propping up on just pillows doesn't do the job that elevating the head of the bed will do. This helps to keep the acid down in the stomach where it belongs.
Most of all darling, remember that you are going to be okay. Even grown adults are very scared when they have these symptoms. Tell them to take you to the gastro doctor because terrible GERD can lead to some other health issues which I am not going to mention because you don't need to be more frightened right now. If they don't listen then talk to someone else in your family who can maybe help or a guidance counselor/teacher at your school. You deserve the best of care and to be checked by a specialist.
For more help you can go to some other websites. healingwell has a very good GERD forum. You can google foods to avoid with Gerd and foods that are okay to eat with GERD.
If you need any other help, feel free to message me here, I think it comes to my email.