Heart problems?

Hi. I have been feeling a little discomfort in the heart region for about a month now. Two weeks ago, I went to the doctor and she said that I had costo chondritis, which was some kind of joint disease that would cause me to feel the discomfort. However, after she injected some steroids, I still felt a bit of the pain, and so she gave me an x-ray of my chest and did EKG(I think that's what its called) on me. The results were all normal other than that I had a little high blood pressure which she said was due to me being too nervous. I felt better for about a week, but the past few days, I've been feeling the same kind of pain in the heart region. I don't know if this is still the same disease i had or is it some kind of heart disease. I've started twitching a lot when I concentrate on a certain area of the body, and it is mostly in the upper body. Also, my left arm is really sore, I don't know if that is from playing too much sports for the past two days. I am 18 years old, is there a possibility I may be having a heart attack? My medical check up is in 5 days, should I wait?  

[Jack54]

Does it help the pain if you take something such as Motrin or aspirin? The effects of the steroids could be wearing off. Hope that you feel better soon :)

[watame]

Well, I've tried motrin and the pain was gone, but the pressure was still there. I was wondering if I should wait another 3 days. Thanks