Hi Daphne,
You should check out the ACICS Transfer Alliance. The transfer alliance is made up of nationally and regionally accredited schools which will accept transfer credits from ACICS accredited schools.
You didn't mention if you are strictly searching for an online program, but Rasmussen College is regionally accredited, and they do offer a digital design degree online. Check out the ACICS Transfer Alliance for other possible schools to transfer to.
By the way, the only one of the Big Three that will even consider credits from nationally accredited schools is Excelsior College, and there is an evaluation process you have to go through. To my knowledge, this has not bee used much, and Excelsior itself seems to be feeling its way through this policy.
Another option is to check out the HETA Transfer Alliance. These are schools that will do not base credit transfer decisions solely on accreditation.
You could also transfer to another ACICS accredited school...ITT Technical Institute. ITT sometimes gets a bad rap because it has the same credit transfer issues you are experiencing with the Art Institute, but they are located everywhere and they do have a graphic design program. It my be the most "stress-free" way of transferring your credits.