Hello anamcar,
I had similar with my ex, three court sessions, and considerably more than 21,000 in fees!
Are you claiming everything that you are entitled to? go to www.entitledto.co.uk to check.
Your ex makes you feel bad because you are handing over the power to him. Take back that power and it will help you to feel better. This sounds easy, and I know it is not!! But if you can start to think about doing this I think it will help you.
I had a terrible time for three years with ex and no money at all and complicated property ownership etc. I told my ex I would go away for a certain amount but he just ignored me and insisted we went the court route. He was so arrogant that he showed his true colours in court, and I was awarded far more than I had offered to clear off for!! Serves him right.
I had depression for many years, which got much worse during this time. I was in a terrible mess.
Now, two years on from all this, I am very happy on my own. I have a nice house, a little business, happy kids. I don't have much money, and as I am getting on a bit there is no prospect I will be able to get a job, but everything is ten million times better!
You will get through this, and come out the other end a happier, better person.
I hope your op goes well, and try to look after yourself. This is very important, even if it's just to treat yourself to a calming bath or something little and inexpensive. Cherish yourself.