### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hi I m female 27 non-smoker, used to be very fit and active but the last year I haven t been to the gym. 3 months ago I had an epsiode of a racing heart and chest pain at work. I think I panicked with it and ended up in A&E and had ECG and full bloods. Everything came back normal. Then 4 weeks after that ago I woke up in the middle of the night with Chest pain, racing heart. I went to A&E again and I had an ECG, and full blood tests and everything came out normal again. I went to my GP and he said it could have been an SVT. Since then I ve had brethlessness mainly on the left side of my body and I ve had a fast heart rate even when I m not exerting myself very much (walking up stairs etc). I have had bouts of stabbing pain in my upper abdomen and a burning sensation in the middle of my back whicChatDoctores and goes. I ve been booked in to have a 24 hour tape to monitor my heart but the doc says this is just a precaution and he doesn t think its anything serious. I don t want to keep bugging my doctor but I m concerned that something is going to happen and the symptoms just won t got away. Can you help? Thanks Nicole I ve been on atenolol beta blockers for 1 month now which seems to have helped my heart slow down, but I ve been extremely tired with it and still breathless. The last few days my heart rate has sped up again. In the past I have taken some illegal drugs and am concerned that I have heart disease, although I m not sure how you would test for this? I don t believe the symptoms are related to stress/anxiety as my fast heart rate seems to be all the time.

### output:

Hi, I passed carefully through your question and would explain that your symptoms could be related to anxiety. Anyway, I agree with you on performing the ECG Holder monitoring as it will certainly help exclude cardiac arrhythmia.  I would also recommend checking complete blood count for anemia, vitamin D plasma levels for possible deficiency and thyroid hormone levels.  Hope I have answered your query. Let me know if I can assist you further. 