I am a 20 year old female who is in good health. I am 5 foot 8 inches and 125 lbs. For the past year, I have experienced chest pain that I can only describe as pressure or tightness that hurts. I also always have pain in my right jaw. The pain in my chest is right in between my breasts. Whenever I have chest pain I always have jaw pain with it. I never have one without the other. It happens about once or twice a month. I have discovered a trend or pattern when I have this pain. I always have it in early evening and last until I go to bed which is a time span of about 2-3 hours. The next morning I never have pain. When this pain starts I am usually sitting on the couch just watching tv.
I went to a doctor to get checked out. I did not go to an emergency room just a walk in clinic. I went in about 2 weeks after my episode and they took x-rays of my chest, ECG, pulmonary test, and cholestorol test. Everything came back normal except my cholesterol which was a total of 212. They told me to stop smoking and slow my caffiene intake. I completely eliminated caffiene from my daily life and I have drastically slowed down from one pack of ciggarettes a day to about 7-10 cigarettes a day. Even with these changes I am still experiencing the pain. Is there a more serious underlying problem and I need a second opinion? Please help me because this is worrying me. Any advice will help.

Thank you for your time,
Lauren