Thanks for your question on Healthcare Magic.
I can understand your concern.
Possibility of stress and anxiety related symptoms is more. But since you had
heart murmur in childhood, we should rule out
arrhythmia (rhythm disturbances in heart) for your palpitations and tingling arm sensations.
So get done ecg, 2d echo and Holter monitoring (24 hours continuous recording of ecg).
If all these are normal then no need to worry for arrhythmia or other heart diseases.
You are approaching menopause. So hormonal imbalance is likely and this can further add stress and anxiety.
So get done hormone levels and if imbalance then you will need
hormone replacement therapy (HRT).
Also
consult psychiatrist and get done
counselling sessions. Try to identify stressor in your life and start working on it's solution. You may need anxiolytic drugs too.
Don't worry, you will be alright with all these.
Avoid stress and tension, be relax and calm.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.