Chest and Swallowing Pain. What is this?

Hi, I am a sixteen-year-old female, and I have been suffering from chest pain for a while now. I do not know exactly how long, but I believe it has been at least a year. The pain will come suddenly, and then leave suddenly as well after having been there a few minutes. I have noticed that usually it hurts in the evening, but I am not sure if that is because I am simply too busy other times to notice. Along with that, when I eat, it hurts in my upper chest to swallow. It feels like my esophagus isn't large enough or something, and sometimes it hurts so much I have to pause and clutch my chest to try to get the food to go down. What is this? I do not think this is related, but just in case, I have had moderate scoliosis since I was born.