Thanks for your question on Healthcare Magic.
I can understand your concern.
Uncontrolled stress can also cause palpitations and similar symptoms.
But since you are having
high cholesterol levels, we should rule out heart diseases like arrhythmia first.
So first 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.
Start lipid lowering drug like
atorvastatin or
rosuvastatin. Continue exercise and avoid oily and fatty food.
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.