How is fear of talking due to difficult childhood treated?

Hi doctor,

I am a 45-year-old male, the youngest of my other five siblings. All through my childhood years up to the age of 20, my parents and other four of my siblings were exposed to a very angry behavior of my elder brother, the oldest of my siblings. The age gap between him and me is 15 years difference. For all I could remember is that almost every day this brother would punch my sister (who is three years younger than him) in the face, pull her hair and drag her across the room just because of talking and laughing at home and for his sake when we were at home no one is to talk or laugh in the house. I used to come from school and hide under a sofa until my mom got home from work. When I got to the age of 20, it was this time that my parents convinced him to get a shock therapy and was given medication for his schizophrenic behavior but after some months he refused to take any medication saying that he is not a sick person. Eventually, my parents convinced him to stay at our native place house where he still resides alone. As a result of this trauma and my silent behavior, I became an easy target to bullies in the school and my surrounding neighborhood areas. I had contemplated suicide sometimes. My sisters (three) are now all married and settled. This experience has affected me and my sister (who is six years older to me) the most as we were very young compared to the other siblings at the time of this trauma. Both of us experienced the same ridicule and sometimes our heads used to jerk suddenly for which we could not control. Now we have overcome this head jerk nervous condition after many years. The ages of my siblings now, in the order of seniority which is 60 years, brother with mental illness, 59 years, sister, 57 years, sister, 54 years, brother, 51 years, sister, 45 years, myself. Please advise on my condition so I may lead the remainder of my life as normal as possible.

Thank you doctor,

The head jerks or tremors have ceased. My sleep is proper. My appetite is well. My moods are often of anger that if I was not exposed to violence and hide under a sofa, I would not have fear of making friends and conversing with people. I find difficulty communicating verbally with people. I do not have any addiction. I have been a caregiver to my paralysed mom where I do not get any sort of relief from any of my siblings (I prepare my mom's meals, sponge bathe, etc.).