Hi unlucky and welcome to the forum
Why have you got debts of £15,000 which are not included in your IVA, and how were these monies borrowed? Were they borrowed pre- or post-IVA?
I am afraid that when you borrow money - the expectation for creditors is that you pay it back. So if these means some sacrifices along the way then so be it! However, it is your life and you can make choices. If you feel that bankruptcy affords you a better option, and that you no longer wish to continue with your IVA, make your IP aware of the situation in the first instance.
Gambling used to be an offence under bankruptcy legislation, but it no longer is - although depending on the extent of your borrowings this could lead to a Bankruptcy Restriction Order or Agreement.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk