Debt relief orders, IVAs, bankruptcy are out of the question for me as I work in financial services (ironic, I know)
Neither ironic, nor out of the question... It's not clear from your post what it is that you're struggling with..
What sort of debt is it? Mortgage/rent arrears would be one thing, credit card debt another. What are your monthly repayments, is that what the issue is - the cost of servicing the debt each month, rather than not seeing an end to paying it off and so feeling you're in a spiral? Or is it that your income doesn't cover your expenses, so you're constantly increasing the debt?
First thing is to look at whether you can move the debt to a cheaper platform. You don't mention your credit history, so could you look at a 0% credit card deal - that would buy you some breathing space. (Being in debt doesn't necessarily mean you have a bad credit history, missed/late payments would mean you may have).
If it's already beyond that, you can ring your providers & tell them you can't afford to pay them. You don't jump straight to an IVA - they should help you to work out how much, if anything, you can afford to pay. They can also consider freezing the debt, so it no longer incurs interest - that affects your credit history but avoids the risk of a CCJ.
I'm surprised that someone who works in financial services wouldn't know this. An IVA would be a problem but shouldn't lead to you losing your job - however, getting yourself into a position where your integrity is compromised because you owe money would.
The Bank Workers' Charity, who are there for anyone who works, or has worked, for a bank: www.bwcharity.org.uk/about-us/our-support-services, and they offer mental health support, and debt advice - so if you do work for a bank, definitely worth getting in touch with them.