In desperate need of Custody modification. Son is almost 14 and father is allowing his live in girlfriend to have my rights. Keeping us apart. Help

My son and I are no longer given the time we were. No communication between Dad and myself (Mom) and keeping everything from me. Situation is changed since order in Jan 2015. Joint Legal Custody but at that time Dad got primary. Prior to all the trouble Dad stirred up our son lived with me and my now four adult children. Dads girlfriend controls everything and makes plans so my son cannot come be with me. They even stopped our overnights and extra time down to minutes. Our son wants to be with both parents equally. I want him to come home. Dad gives all responsibilities to his married to someone else girlfriend instead of me or doing it himself. Please help! Dad is very controlling and a narcissist and son is scared to speak up. He will talk to a judge or his own attorney. I cannot file modification by efile myself. Help us! Sons medical and mental health not being taken care of by Dad either.