Unfair hearing / solicitor negligence.

Hi there I'm hoping someone could help me as I am in desperate need of some solid advice on how I stand.

I have raised my son since his birth as his mother was absent due to work commitments and suffered from post natal depression etc.

We seperated in 2014 after his mother walked out on us without any heads up and she hardly saw much of our child until 2015 after finding out she was pregnant.
She has always tried to control things with my son and I and has threatened that I wasn't getting to see him again several times mostly over money ?!

This happened again in June this year and I sought legal advice to begin court proceedings.

However my application was delayed by my solicitor and my ex partner took me to court making me the defendant.

I was advised by my solicitor not to allow contact and my ex stayed I kidnapped out son to the courts along with much more false allegations which I have been able to prove as lies.

The court has since made a contact order and I have lost main care of my son.
My son is devastated by this and is extremely upset !
He begs me not to take him to his mothers and so on and I have no choice but to take him,
They have never had a bond with each other since she wasn't around in his early years growing up and now she expects him to just be with her and be happy.

He misbehaves and urinates on her floors, breaks household items and argues with her and asks repeatedly to come home with me but is told not to discuss me there and is smacked for doing so.

6 months after leaving us she was in a relationship with another man and was pregnant,
Our son was really confused by this and didn't know what was happening he was asking if he had 2 dads and so on !

My solicitor failed to defend me in court and sat in silence during the first 3 hearings the last one being a child welfare hearing.
He was aggressive and intimidating towards me and told me to sack him if I wasn't happy with his services.

That's what I done in the end and it turns out that he has done nothing to help me only make things worse !
His advice to not allow contact has went against me and my new solicitor is not sure if this can be sorted out.

I am concerned for my son and it's worse known he is really upset by all that's happened.
He is not used to being with his mother and is afraid of her partner as he smacks him etc.
Her partner had called my son names such as gayboy, gives him wedgies, Chinese burns and blows smoke in his face !
His mother and her partner talk negatively about me and my son is upset hearing this !
He's told me he is going to run away from his mums etc but I have had to tell him not to as it's dangerous in the streets.
He replied saying he's allowed to play outside and his mum wouldn't even know !
I'm shocked at the way this has worked out and considering the courts are supposed to have the child's interests at heart that had not been the case here and it has been the complete opposite !

What can I do to have things looked at again for my sons well being ?

I have tried to keep this brief so alots not included but I have tried to include the main points.

Any advice would be greatly appreciated !

Thanks in advance....