I've had braces for 5 years and haven't been to the orthodontist in 4 years. My brackets & wires have fallen off. What do I do?

I can afford treatment now, but I can't afford to pay the left over balance at my old orthodontist. I am also to ashamed to go back there. I really need to start treatment because I feel so embarrassed everything I open my mouth. I have been to the dentist and they already know my situation and encourage me to start treatment again. I am just not sure if another orthodontist will work on me since I have cement and glue on my teeth from another place. What do I do? Please help me.