I see you are in italy. here in america we have many mental and physical health problems that cause uncontrollable spasms, twitching and body tics. most are what we call neuromuscular diseases (physical health problem not mental but does sometimes affect a persons mental wellbeing) one example is Multiple Sclerosis. many people with this (like me) have uncontrollable spasms, twitching, numbness and many other symptoms. and no its not a good feeling. sometimes my wife will hold me and that can help.

here in america mental disorder wise some people (like someone I know) has the feeling like they are shaking, twitching all the time. their treatment provider called it anxiety and psychosis because nothing showed up on the physical exams and for her it only happened when she was having anxiety problems.

a normal situation here in america where people go through this is called a physical problem called withdrawal. here its quite common for people who drop off their meds unexpectedly or use drugs and alcohol to g through the physical and mental sensations of shaking, twitching, ticing.

my suggestion is talk with your treatment providers. they will be able to help you discover why you are experiencing these things and get you treated for it so that you will feel much better.