What dreadful news to come to terms with. My thoughts are with you both, and I will try to answer your post if I was acting as your IP.
First of all, dealing with the IVA fades into insignificance in comparison with your wife's illness. If you can afford to make the ongoing payments into the future, do so, but have a chat with your own IP because there may be good grounds here for you to take a payment break for say one year, on grounds that the payments will be made up in the future. This will enable you and your wife to spend time together, without worrying about the household budget.
I wish you the very best of luck with everything, and also hope that you have an understanding IP and creditors.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
http://www.melaniegiles.com/ivaEnquiry.asp
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http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp