Hi Starboy
Please stop panicking. What is done is done and you must now work with your IP to sort this out. The first step will be to stop using the account and get yourself another bank account open - or negotiate with HSBC that you continue to use the overdrawn account with some form of gradual reduction. Have you also explored the possibility of a family member or friend paying off the overdraft for you?
Either way you must speak to your IP to seek his/her advice. If you were genuinely not told that you could not incur any credit during the IVA - and do check the terms of the IVA document you signed as this is usually referred to expressly within the proposal - then they may be sympathetic to helping you sort this out.
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