Try calling the credit card with the higher rate and ask if they will reduce the interest rate by a point or so for you - that sometimes works, explain you've been a customer for X years, etc. And do work on paying that one down first. If you can, pay more than the minimum for the other card as well, so you are at least making a dent in that one, too.

Have you made a budget,by which I mean make a list of all your standard monthly expenses - rent, electricity, credit card bills, etc., and then figured out how much you have to spend on things like food and other expenses? That's sometimes a good reality check, and might keep you from adding any new credit card purchases for the time being!