Your IP has a duty of care to you to ensure that you continue to receive best advice during the IVA and that he gives whatever assistance possible in order to try and sort out your problems.  
Would it be possible for you to try and consolidate the secured borrowings on your property to avail of lower repayments, or maybe seek a variation of the terms of the arrangement to accomodate lower payments.
If your IVA has been taken out fairly recently, you may even have the ability to reduce payments by up to 15% if your disposable income has dropped without the need for formal variation procedures, so I suggest you get your IVA papers out and have a good read through them.
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