I think I'm starting to recall your name.
If you weren't getting support from the guy during the three years you've been separated, as I would have said on other threads, you may have a very hard time convincing the court to give it to you at this point.
You're always free to lock in an attorney in your engagement/retainer agreement/contract, and include certain provisions in the event they bail out of nowhere, e.g., *refund*. Even if that attorney is an associate at a firm, you can get the firm to agree that if that associate leaves, the case can go with him-her if you choose.
If attorneys are bailing on your case left and right, you're not doing proper research on the attorneys before you hire them; only other explanation is that you're having problems paying them or are a *really* high-maintenance client (code for other words).