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Holter or event monitor is necessary for analysis of arrhythmia
/ Alcohol / Tobacco (smoking) / Caffeine (too much coffee, cola) / Medicines like Phenylephrine
used for ‘cold’; Salbutamol
used for asthma and so on are common causes...
Fever / Thyroid
/ Vitamin D, calcium and magnesium
may all have a role... At times, abnormal nerve paths in the heart (bypass tracts) are responsible!
Anti-depressants can have side effects...the dose is small and may not be significant in your case...Try ...Anxiety cause arrhythmia > Arrhythmia causes anxiety > a vicious cycle sets in. It has to be broken at some point and the drug can help... Also drugs like Beta-blockers are useful – they have multiple benefits and help in anxiety, arrhythmia and so on..
If there are no clues and if the problem is still bothering to the extent of interfering with life style, you can opt for Electro Physiological Studies (EPS) > it resembles angio – a catheter is put inside the heart / electrical activity recorded / stimulation and suppression tests are carried out / suitable medicine tested and so on. Though the test is the gold standard, it is INVASIVE and is not generally done unless there are compelling indications. This super-speciality expert is called ELECTRO-PHYSIOLOGIST. There are other advanced treatment modalities like ablation, which could be done during EPS.
The treating doctor may suggest them depending on need, based on his assessment of the situation.
Wishing speedy recovery