These problems are very commonly seen in patients with underlying ischaemic heart disease condition. Most people tend to waste their time thinking about gaseous disorders. So, please consult any cardiologist,if your problem increases. Initially, echocardiography and ECG must be done. you may also check for blood for fasting blood glucose, fasting lipid profile, fasting TSH, CPK-MB. Check your blood pressure too. Review with reports for further suggestion from my side or treatment.