Breathe in, out and relax.

Are these three exercises help to stabilize a nerve system, and prevent neurasthenia attack, and you can sit in chair or lie on the spine.
Breathe in deeply, show a front belly wall, as more far, delay breath on a few sec as on 20, after slowly relaxing breathe out.

Breathe in slowly with a full breast, delay same breath, like in first exercise, breathe out faster through clenched teeth's, and sound s say.

Close eyes and before you a cloud of pink colour, relax, and with nose absorb a pink fog, for two sec delay breath, breathe out.

And these exercises doing on ten times, and for all complex are 2 minute continuation.