I want to see my kids

Hello, my name is Robert. I have two wonderful kids aged 8 and 11 who i love dearly. I haven't been able to see them for over 5 weeks due to my ex not letting me see them. They are not allowed to call me on the phone and i am not allowed to call them. I couldnt see them on fathers day or even for my daughters birthday :(. I am away working all week in my truck and i usually see them on the weekend, but she has stopped that. All my money goes towards bills and rent and work so i cannot afford a solicitor as the prices are so high. I love my kids so much, its killing me not being able to see them. I havent done anything wrong and i dont deserve this.  I can't get any other help elsewhere so my only option is a solicitor. If i cant raise the money through here i will have to start selling my stuff.  Any help is appreciated. Thankyou.