Hi and welcome.
Your husband can do an IVA on his own, but for any joint debts, you would still be chased for the entire amount.
As for the cards, I am not sure, I imagine if you have your name taken off them, it would be classed as his debt. The cards would disappear into the IVA so they won't exist anymore anyway.
You do need to change banks as there is a possibility they will take money from there to offset against the loans. Be warned that even though you may cancel the direct debit for loan payment, they may still take it out. That happens quite a lot.
I would advise you to give an Insolvency Practitioner a ring as soon as possible and they will explore all your options with you. Visit
www.iva.com for a list of IP's, or you could give Melanie Giles a ring, she comes highly recommended, and her details can be found on the experts page.