Don’t make any more purchases until I am totally in control of that card.
Credit Card interest rates are sinful and astronomical. Here is a comparison from interest.co.nz http://www.interest.co.nz/borrowing/credit-cards
These calculators are a reality-check and a great help!
http://www.calculatorweb.com/calculators/creditcardcalc.shtml
https://www.interest.co.nz/calculators/credit-card-minimum-payments
https://sorted.org.nz/tools/debt-calculator