Thanks for posting your query.
With the described symptoms, there may be possibilities of sudden onset arrhythmias or panic attacks.
Presence of palpitations along with dizziness
suggests the diagnosis.
You should consult with internal medicine specialist and should go for thorough check up.
You should go for electrocardiogram (ECG), holter monitoring, thyroid
profile, serum ACTH level and serum epinephrine and norepinephrine
If all these investigations are found to be normal then there is possibility of panic attack and in such case, you should consult with internal medicine specialist/ psychiatrist
Dr. Mayank Bhargava