<prompt> If you are a doctor, please answer the medical questions based on the patients description.I m a 46 yr old female that has been diagnosed with SVT. In April of 2014 I had catheter ablation that was unsuccessful. I currently take two tomborcor a day. But the last couplever of days I been experiencing lightheadedness and pain under the right collarbone but I m not experiencing SVT attacks could this be something else or it s it possible to be in afib and not be aware.  <response>: Hi welcome to Chat Doctor. I understand your query and concern. Many of your symptoms are related to SVT. In case of failed catheter ablation Its important to rely on Chat Doctor. I advise you to have a baseline 2 dimensional echocardiography, ECG and lipid profile to assess the basic cardiac reserve of your heart. Restrict the intake of salt to less than 6gday. Regular physical exercise in the form of brisk walk for 20 min a day for 5 days a week is pretty useful. 