<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, am having mild chest discomfort while biking. New to exercise after long long layoff. Very anxious and scared. Cardiologist wants me to lay off caffeine and alcohol for a month and prescribed 25 mg of Toprol twice a day for one month. He also told me to exercise for 30 minutesday everyday. Stress test in a month. I ve been so worried that I m wondering if I m bringing this on mentally.  <response>: Hellowelcome to ChatDoctoryou have not mentioned your age and much information about your symptoms...well chest discomfort can be due to various underlying conditions such as1 angina due to underlying heart pathology2 lung disorders3 pleurisy4 Costco Chat Doctor. E gastroesophageal reflux disease7 acid peptic disorder8 arthritis of shoulder bladesribs you need to get 2 very simple investigations to make a conclusive diagnosis1 ECG2 X-ray of chest once you get these tests either send me a scanned copy of your reports or consult your treating doctor take careChatDoctor 