Thanks for writing to health care magic.
Palpitations and dizziness
of sudden onset indicate that there may a arrythmia
. So you will have to report to your doctor who after further investigations including a ECG can come to a diagnosis and start treatment accordingly.
Palpitations can also occur in various conditions which include anxiety
Do you have pale palms and soles or pale tongue. That could indicate anemia.
Please reply in detail so that I can help you better.