You're lawyer is likely stuck in a dilemma.
There are the actions which the lawyer ought to take, which involve contacting the law society to report and for advice from the ethics committee regarding a potential report to the police.
Then there are the actions which will help your case, which involve doing none of that.
Now, since the other lawyer has brought a suit against you, I believe that your lawyer should act. If the opposing lawyer is wrapped up in the finances which are themselves the subject of the litigation, then that's a pretty clear conflict of interest.
You don't want to threaten your lawyer, because you need to have a good working relationship. I recommend that you have a fulsome discussion and meeting and ask your lawyer why nothing is being done about this; maybe there is a reason and you need your lawyer to explain it to you. If that's not satisfactory it's time to get another lawyer.
Perhaps your lawyer is friends with the other. Perhaps your lawyer doesn't want to "rat out" a colleague. Perhaps your lawyer has other cases with this lawyer, and yours doesn't want to risk derailing those cases because of this one. You need to ask the hard questions and insist on answers.
I hope that helps, I don't know if there's anything else I can add. Please reply if there's more to discuss. If I've answered you, I'd appreciate a positive service rating please. That's how I get credit from site for answering you today.