Hallo. i had tachycardia 1 year lately when i want to go to bed, that makes me insomnia. is it normal? how can i prevent?

Based on your question, anxiety is the most likely reason for the insomnia. If you were treated by your physician at the time of tachycardia, he would have described the type of tachycardia you had and may have reassured you. It will be helpful if you can return to the same physician for an explanation and reassurance. This is likely to be helpful.

I agree that anxiety is the most likely cause of your real or perceived tachycardia as true paroxysmal tachycardias do not appear like clockwork each night at bedtime. I would like to be certain by either seeing an EKG done during symptoms or having you wear a Holter Monitor as an outpatient for 48 hours and have you note exactly when you feel you're experiencing tachycardia for accurate diagnosis