Hello and thanks for writing. I can understand your concern and would try to help you in the best possible way. The symptoms you have described are some what red flags and need a thorough workup to get to a cause. A few conditions that might cause them include cardiac arrhythmia, angina, anxiety or Blood Pressure issues. You need to be evaluated with a complete medical history and physical examination. You may also need few tests like BP measurement, CBC, KFT, ECG, Holter study and others to rule out cardiac ailments. I suggest you consult a physician and get yourself worked up for the problem.