You will have to deal with the warrant. Most likely that will involve coming back to LA. Do you still have the same attorney? If not, you can try and find one in your area here on AVVO just select "Find a Lawyer" at the top of the page. Good luck.
If you still live outside of Louisiana, this will be difficult to take care of. Usually a warrant can only be quashed if you turn yourself in and see a judge to have a new court date set and conditions of your release. Contact an experienced DWI attorney in the area of your offense to find out your full range of options. This website have many good candidates to choose from if your previous attorney is not an option.
There are a lot of moving parts here. The first thing you'll need to do is explain this case to a particular lawyer who will listen and figure out a plan for fixing the problem. After that, you will probably have to make a trip to Louisiana to get the warrant recalls. It's possible that you won't have to make that trip, but if I were advising you, I would begin making plans. Once we get the warrant recalled, we'll fight your case like every other DWI and hope the prosecutor understand your predicament.