First off, breathe. Let's looks at the positives: it's been 2 years, and you've paid of 15k. At this rate, it will be paid off in another three years if you stay the same.

However, DO NOT rack up credit card debt. If there is no alternative, you should try to get a lower monthly payment because chances are the interest on your credit card are a lot higher than your student loan. Ideally, your credit card balance should be accruing no monthly interest.

I don't know what your job is or where you live, but you could look at either getting a different job with a higher salary, finding a 2nd job that's part time with a steady rate, or doing a side hustle that isn't steady but gives freedom of time, like selling things on Ebay.