Thanks for your question on Healthcare Magic.
I can understand your concern.
In my opinion, we should first rule out
arrhythmia (rhythm disturbances in heart) because your symptoms like Fluttering feeling in central chest, missed beat,
dizziness etc are common symptoms of arrhythmia.
So better to
consult cardiologist and get done ecg, 2d echo and Holter monitoring (24 hours continuous recording of ecg).
You may need anti arrhythmia drugs too.
Your runny nose and stuffiness is mostly due to
viral rhinitis.
So do steam inhalation 4-5 times a day. Take antihistamine and anti inflammatory drugs. Drink plenty of fluids orally and keep your self hydrated.
Don't worry, you will be alright. But first rule out arrhythmia.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.