When someone does something wrong, the things which I want to see from them are:
-Acknowledge they have done something wrong (you’ve done this)
-Apologise properly (you’ve done this)
-Take the lead in fixing the problem
So, my advice would be to get very practical and make yourself a plan, which you can stick to in order to fix things. Very bluntly, you’re no use to your husband and kids if you’re dead. But alive, engaged and working hard you can 100 percent fix this.
You’ll need to decide what is feasible for you, but mine would be the list below. I’ve focused on short-time-frame stuff and permenamt changes as those seem most likely to work with your adhd.
Short term:
Sell some of the things which you have bought and use the money you have earned to pay against the credit card.
Have a no-spend month in November to pay off the overdraft (use up food, clothes,stuff which you have in the house, only use petrol for school run and work, no daytrips or takeaways or meals out)
Speak to DH about having a low key Christmas and about making Christmas decisions jointly - don’t buy anything for Christmas without joint discussions.
Can you increase your November income? Take on some extra shifts, or ask for a raise at work?
Longer term:
Cut up the credit card and any store cards etc which you own. Just use the bank card from your bank account. Any time that you max out your overdraft there, or get worried that you might, take out cash for the week, tell your husband what has happened, and ask him to hold onto your card for a few weeks.
Either get rid of the smartphone and replace with a brick phone; or delete off all addictive apps and get some sort of blocking tech so that you can’t add new ones, or look at the hybrid phones where you can get google maps and WhatsApp but can’t download apps. If you go for option 3 don’t buy this, ask your family for it for Christmas.
Make a plan to pay off the debt yourself from your own wages so that it doesn’t impact your husband. Proactively go to somewhere like citizens advice with your bank and credit card statements and ask them to look at how much you can afford to repay each month. Can you get the debt onto a 0 percent card whist you pay it off?
Pull out a list of all monthly personal and household spending for the last four months and check that you’re not paying for anything which you don’t need. Cancel subscriptions which you aren’t using etc.
Make a plan to jointly review spending with your husband at the end of the month each month. Be really honest in these reviews and show each other your statements etc. once you get in the swing of doing it, it’ll help you be honest with him in the future.
Good luck, you’ve raised this in time and can sort it out yourself.