Hi there and welcome to the forum
You would need to review the situation with your IP to see whether a payment break would be appropriate, and would probably need to produce a doctor's note to confirm your most likely return to work date.
Ultimately, this could result in the failure of your IVA, but if you had paid in a number of contributions it could be possible to persuade creditors to accept a reduced dividend based upon the fact that you could no longer service the IVA.
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
See customer feedback at:
http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp