You should probably not try and get an additional card but, rather, make an attempt to increase the limit for the one you already have, if you do anything along those lines at all. The following thread has some good tips and information for consolidating debt and other strategies to raise your credit score.
https://ttlc.intuit.com/community/credit-score/discussion/has-anyone-ever-consolidated-credit-cards-...
Simply put, you would most likely be better off just concentrating on paying down your current debt as much as possible.
