How not to succumb to psychosomatics?

Learn self-regulation of emotions and positive thinking through the construction of adaptive mechanisms in the central nervous system of responses to stress by methods of self-hypnosis. Seek benefits from negative situations to trigger the power to overcome them

The only effective method I know of is not to bring the matter to psychosomatic problems.
"not to succumb" to it is unrealistic.
Yes, you can find a current psychotherapist, and somehow overcome the problem ... but this can be done before the problem reaches the psychosomatic level.
And on your own ... well, perhaps if the person is a psychotherapist himself , then it may work out, although the chances in this case are far from 100%.
Working with yourself is much more difficult.

Try to remember one simple belief that allows you to avoid psychosomatics and nocebo effects:

How you relate - so it is expressed.

For example, how it works I can tell the following story:

A successful businessman, a woman, regularly fell once every six months into a weekly paralysis of the whole body. The doctors were unable to help. After a week, she calmly recovered and continued her former life. Her family appreciated hard work and absolutely did not take rest. It was completely forbidden to rest with them. And such a negative attitude to rest, prompted her body to force her to rest in the most negative way. Changing my attitude to rest and allowing myself to take a vacation - paralysis no longer occurred.

Timofey - in fact you are asking - how not to obey either your consciousness (psycho) or your body (catfish). This is a very strange concept. And so far difficult to implement. If in 30 years the state, the employer or your slave owner begins to implant remotely controlled electrodes into your brain, this problem may be solved. But many people might not want to.

Change beliefs, attitude towards things, your inner attitude. Monitor your thoughts closely and keep your head clear.

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