No need to apologise, Doberman. Your 'rant' was informative and completely understandable.
What I don't understand is: if you are simply a witness for the prosecution (CPS or Procurator Fiscal), the client is the Crown, not you. In which case you cannot sack your barrister/advocate, or solicitor.
If you are being defended then you are the client, and so yes, you can seek new representation. But what you say is confusing me somewhat.
Have you been charged with any offence?
You should look at the possibility of claiming criminal injuries compensation for your broken nose, plus the psychological harm you have clearly suffered by being fearful of leaving your home.