Why am I having chest pain with palpitations and acid reflux?

Hello doctor,

I do not know if everything that happens on my system are still normal.

First, mild chest pain. I do not know if it is associated with high blood pressure since I also experience headache almost everyday. The headache feels like there is something that snaps on upper back part of my head. Second weird thing is I often had palpitation (not just in heart but also on my wrist pulse and neck pulse) even though I am not taking coffee or any drinks that contains caffeine. The symptoms mentioned are together with shortness of breath, weakness, dizziness (worst of all, I even lost my balance and end up falling on the floor and having a black sight but I never been unconcious, that only goes for seconds then after that, I will be back to normal. I also noticed that since the class started last year I find it difficult to concentrate. Another thing is sometimes when I lay down at bed to sleep I experience acid reflux and sometimes had a cold feet.

For my medical history, the last time I had a worst disease is when I was in grade 3 (I am grade 12 now) and I was diagnosed with gum infection. I got cured and is not taking any medicines now. The shortness of breath anyway started when I was in grade 7 ( I am a grade 12 now) and I do not think there is something off in my lungs because when I was in grade 10 I had an X-ray then the result states that my lungs are normal. I have not visited or consulted to a doctor regarding on the symptoms I am feeling because aside from it, it costs a lot for a check up. I also feel anxious.