Your husband needs to consult with an attorney to find out what can be done to resolve the case. Most attorneys provide a free consultation and will be able to advise you what needs to be done and how much trouble he is in. It could be as simple as getting the requirements completed to revoking his probation for jail time. You won't know though until you meet with an attorney and get a gameplan.
You and your husband are living in fear that may be able to be resolved quite easily. I would chose a local attorney from the county where the probation is though.
Answers to AVVO questions are for general purposes only and do not establish an attorney-client relationship. This answer is not a substitute for legal advice and should not be relied upon without a full consultation with an attorney that can fully look at issues involved.