Thank you for the additional information, it was very helpful.
My thought would be to go ahead and proceed with the contempt issue against him. From there, you could do one of two things...
If you don't think he'll do anything in response, then just proceed with the contempt. In your motion, simply detail that the order exists, he is supposed to make payments pursuant to that order and he has failed or refused to do so.
Or, if you prefer being more proactive, you could add some language to your motion. You might consider indicating in your own motion that you are now falling behind on your support to him but that his own actions have caused the problem as you can't afford to pay your support due to his non-payment.
I hope you found my answer helpful. If so, please click on the green ACCEPT for my answer. This is necessary for me to be paid for my work and so that I can get credit for assisting you. Even if you are a subscription member, you will need to click ACCEPT. Your question will not close, and you will still have the opportunity to follow-up if needed. Leaving a bonus and positive feedback is not required, but doing so is certainly appreciated! Thank you and good luck!
Also, several customers have asked how they may direct a question to me in particular. If you specifically want me to assist you in your legal matter, just put "FOR JOSEPH" in the subject line and I will gladly pick up the question as soon as I am on-line.