There is no such thing as a "joint arrangment" merely mutual and interlocking individual voluntary arrangements,which can relate to you and your husband.
You do need to consult with an insolvency practitoner who will be able to advise you about all of the options which are currently available to you.
How long do you anticipate that your husband will be off work for? If he is going to be able to return to work at some stage in the future, then maybe you just have a temporary problem which could be resolved in time with a little more leeway from your creditors.
If your husband will be unable to return to work, firstly ensure that you are receiving all benefits you are entitled to, and secondly I would seek advice from an insolvency practitoner as to all of the options which are available to you.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk