As all previous poster have said you really need to understand where every penny is spent. I used to have a notebook where I wrote everything down. You also need dh to commit to this. And every day (yes every single day) you both have to sit down and look at what has been spent.
Don't be horrible to each other about £3 spent on emergency chocolate at the garage, but do noticec it, and recognise that it wasn't necessary.
Don't allow your pay rise to make either of you feel relaxed about your finances, see it as an opportunity to get things back on an even keel and to get ahead of the game.
When you are doing your budget calculations use your take-home pay and the lowest amount that dh is paid. That is your bottom line - you need your normal monthly living costs to come within that amount. Even if that means living on baked potatoes and beans. Learn the price of everything. I bought a carrot at the supermarket (had to weigh and price it as using self-scanner). It was 12p. I bought an apple and it was 65p. So carrots for snacks, not apples. Certainly not grapes at £3.25!!!
After one month of a rigorous approach you will know how much you can put towards paying off your debt. (credit card first). As soon as you start to pay it down you will immediately feel better. You you will be able to look ahead and be confident about the timescale for when you can be debt free and on a positive track towards saving.
Unexpected cost are just that - unexpected, but the often appear every month. I should have had £100 excess every month, but almost every month something accounted for most of that.
You are doing the right thing to sort your finances out now, before they get out of control and you feel overwhelmed. When I was in a similar situation I paid £160 per month to my debt, £20 to my family, and £20 to savings. If you could do similar, in 15 months you would have cleared the debt, you'd have started to pay back your family member (and could subsequently clear the debt [£160 + £20] within another year. Plus you would have £540 in savings - a good head start to a proper debt free life.
The key thing here is that you and dh are on the same page and adopt the same approach, so you're not the one worrying and making savings while he is spending on unnecessary things.