How you can deal with this problem?

In case you notice that you get an attack of strong and fastened “heartbeat” after some stress or without any particular reason, be aware that it is a very common phenomenon that happens both among men and women in any time of their lives. The feeling is very unpleasant and we all want to stop it as soon as possible. The experts in this area are recommending 3 simple ways that can be done for less than a minute and by the help of which you can act quickly on your pulse and slow it down as well.
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-The cold water method-for this method you will need very strong cold water, icy if possible. All you need to do when having a fastened pulse is to take a deep breath and plunge your face into very cold water and stay there as much as possible. This procedure stimulates your vagus nerve that has an impact on slowing down the heart rhythm. When you hold the face into cold water the body sends a signal of slowing the metabolism down, more familiar as a plunging reflex that also causes quick reducing of the number of the heartbeats. That is the same reflex that helps some  people to survive a longer period into cold water by slowing down their body metabolism.

-Very deep breathing-Take a really deep breath, to the point when you can’t continue taking breath anymore. After this, breath out quickly from the lungs. Repeat this procedure till it’s necessary. But remember that it’s not important only to take a deep breath, since this way you won’t slow down the heart functioning. You must breath in to the final limits significantly more than just a deep breathing, and only this way the same will have a positive effect on slowing the pulse.

-The Valsalva maneuver-you need to breathe moderately.
The Valsalva maneuver
Close the nose and mouth and take a strong blow inside without throwing out air as if you are straining in the toilet. Keep this pressure up as long as you can take. After this breath out and relax. You can feel a slight dizziness from this, but that is all normal.

Try from each of these methods per several times before continuing to the following. After a while you will bring your own conclusion which one suits you most, which one is really helping you most and how quickly and efficiently you are calming down the heartbeat. On the other hand, if you have such heartbeats more often, and the same last for 20 minutes or more, or if you feel faint, pains and other hardships, you are warmly advised to ask for a professional medical help.