What medicine can I take so as not to use psychoactive drugs?

Indeed, you should not stop therapy with a drug such as Pregabalin without consulting a doctor. If the patient feels severe side effects, then the best solution is to contact the attending physician and look for a solution to this situation (change the dose, change the drug). Herbal medicines are not able to replace synthetic drugs in terms of specificity and potency. In the situation described, I believe that you should, however, consult a psychiatrist as to further treatment. "Psychoactive drugs" or "psychotropic" are a very broad definition, so it is difficult to answer what kind of "substitutes" you mean: https://www.gdziepolek.pl/opinie-i-pytania/69351/rexetin-czy-rexetin-to-psychotrop I can only answer that side effects after drugs acting on the mental sphere may or may not occur. Sometimes they are more severe at the beginning of therapy. It is not a good idea to read about the side effects that have occurred in other patients. This does not allow you to reliably predict what the tolerance of a given drug will be in your individual case. I enclose additional information: https://www.gdziepolek.pl/artykuly/czy-bac-sie-dzialan-niepozadanych-lekow