First a few things on credit scores: They're important, and you should aim to have a good one, but you shouldn't obsess over the numbers. Fluctuations are normal, but keeping tabs on your score will help you make good financial decisions. Watching your score could even help you spot identity theft, because an unexpected score drop could indicate someone is misusing your information.
This is easier said than done, but reducing the amount that you owe is going to be a far more satisfying achievement than improving your credit score. The first thing you need to do is stop using your credit cards. Use your credit report to make a list of all of your accounts and then go online or check recent statements to determine how much you owe on each account and what interest rate they are charging you. Come up with a payment plan that puts most of your available budget for debt payments towards the highest interest cards first, while maintaining minimum payments on your other accounts.