unhappy with representation by attorney--its been 19 months is it too late to change attorneys?

It's never too late to change horses but you might find it difficult to get someone involved this late in the game becasue of all the history in your case and because your current lawyer may claim an entitlement to a portion of any fee that is ultimately payable, leaving less money to pay a new attorney.  If you're not getting answers that are satisfactory, I suggest that you start meeting with your attorney in person when you want to discuss the case.  Maybe a monthly date to keep things moving along?  Ask him/her for a 30-60 day plan of action.