Need help to recover narcissistic abuse.

My husband is a narcissist. I need help overcoming emotional traumatic experiences. I think I am going through PTSD, getting flashbacks, crying now and then, feeling sad, low concentration. He has abused me verbally and has no remorse for anything. He tried alienating me from my mother who supported me after witnessing his disrespect for me. He has been manipulative, trying to convince others that my mother is destroying our marriage when the reality is he was about to throw me and my son out of his house because of his brother and his wife. He tried strangulating me on one instance and then I left the house. I had to repeatedly prove myself to my uncles by showing them the screenshots of his texts and mails of how he has been abusing me, cause they got manipulated. He has recently threatened to take away my son. I doubt he has an affair with his brother's wife and the doubt has many reasons attached. His concern and apologies are always fake. I need help to overcome the situation.