is a myth or true that withdrawal method can cause memory loss or sometimes anxiety?
It does cause anxiety.
The Physiology of drug addiction, is that one's body becomes accustomed to the intake of said specific drug. The certain neurotransmitter that the said drug induces is procured; however when one inhibits the intake of said drug, the body runs into conflict.
Pleasure responses in the brain are a type of reward pathway whereby activating dopamine receptors encourages repetition of the responsible behavior. Drug addiction interferes with/over-activates this natural cycle by altering neural function in such a way as to render the brain circuits mediating various behavioral effects of these drugs more, or less, responsive to those effects. Several neurotransmitter and neuropeptide systems have been shown to disrupt brain circuits mediating mood, affecting the underlying addiction process. Beyond the effects on serotonin and norepinephrine levels, which in turn affect mood and the pleasure-response system, drugs also inhibit an individual's decision-making process, implying an inhibition of free will and a hindrance of the I-function.
This is a current Law and Specific Study subset within the field of Medical Psychiatry, actually.
And this said topic is not a 'myth' but is Natural and Scientific Law.
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