I suggest you go back to court and ask to see the Judge, through a court officer or the clerk's office. Then ask the same question you asked here and ask if you can go back to jail to pay off your fines. Most Judges will understand and either put you in jail or forgive the fines so it doesn't cost the county even more to house and feed you while your presence in jail pays the fees set by the county - through the Judge.
One thing that is interesting is you waived counsel at arraignment. Did the Court ask you to do that or did you do it on your own? That is a very important question and it concerns me if they allowed you to proceed without an attorne instead of assigning Legal Aide or the Public Defender's office. I'd like to know this for future reference because it sounds inappropriate.
This answer is not intended to form an attorney/client relationship and any answers do not constitute direct legal advice and should not be followed unless and until you have spoken with an attorney of your choice.
Go to the clerk's office (early) and have your matter put on calendar. Explain your situation to the Judge and he will advise of your options as to paying off your debt.
Legal disclaimer: You can learn more about me by clicking on my Avvo profile. Disclaimer: Please note that this answer does not constitute legal advice. It is merely intended to provide general information to aid the poster in finding answers to the problem posed. This answer does not create an attorney-client relationship. In most cases, it is best to contact an attorney directly to find answers to your problems.
Sign up to receive a 3-part series of useful information and legal advice about DUIs.