I would suggest to not do anything that would make yourself look worse in the end. I would avoid saying things negative that he will then turn around and try and sue you (again!) for, such as leaving damning comments in the counter-suit.
However there is nothing wrong with counter-sue(ing) for the cost of your lawyer and the cost of the trial. Find a good lawyer and defend yourself.
However there is nothing wrong with counter-sue(ing) for the cost of your lawyer and the cost of the trial. Find a good lawyer and defend yourself.