Hiya pleasehelp
I've done work as a debt adviser in the past and I know how overwhelming it can be when you don't know what to deal with first.
If you go on the National Debtline website (I'm not good at links sorry) you can download an information pack and deal with it yourself. Ideally if you can get to a CAB, which is hard if you're working full time I know, they can explain it all properly, advise you of your options and even contact creditors on your behalf.
First things you need to do are:
Find the last letters/statements from each of your creditors which show how much you currently owe them.
Decide which are priority debts and which are non-priority. Priority debts would be things like rent, mortgage, Council Tax, HP agreements as they have more serious penalties if you don't pay like eviction, repossession of property, prison (for Council Tax). Non-priority debts are credit cards, store cards, catalogues etc where the ultimate penalty is a CCJ.
Work out what your income and outgoings are. Be realistic about your outgoings don't underestimate. From that work out how much money you have left over every month/week.
Now is where it gets a bit complicated! You can then make offers of payment based on your total debt e.g £20,000 and how much money is left over every month e.g £150 which means that each creditor gets a proportion of the left over money depending on how much you owe them. There is a calculation to help you do this - I'll try and keep it simple.
You take each creditor one at a time and divide the amount owed to that creditor by the total debt. Then you multiply that by the amount of money left over. This will give you a sum for each creditor.
For example: Barclaycard - owed £5085.
£5085 divided by £20,000 multiplied by £150 = £38.00 per month to offer to B/card
M&S Storecard - owed £3500
£3500 divided by £20,000 multiplied by £150 = £26.25 per month to offer to M&S
I know it's really complicated so don't panic if you don't understand. You could always divide the money up equally between them as a last resort.
You can then write to each creditor and explain that you are going through some difficulties. Tell them that your offer of payment is pro-rata and request that they freeze any interest. State you are requesting that they accept your offer for a period of 3/6 months and if your circumstances improve then you will resume normal payments or increase the current payments.
The National Debtline pack has sample letters you can use and should explain how to do the calculation better than I can! If you ring them they can send the pack out to you if you can't download it.
As an aside, and I'm not saying things would progress this far, but creditors do not have to accept your offers and if they want to they can pursue you through court. However, the court would not order you to pay more than you can afford and as long as you kept up with any payments the court ordered you to make then the creditors can not take further action against you e.g bailiffs.
The worst thing you can do is ignore the creditors as they will not stop chasing you and if you can show you have tried to negotiate with them then it will go in your favour. You may have to put up with your credit rating being knackered for a few years but this can be unavoidable unfortunately.
Finally (phew) what I have described is a debt management plan but there are many other options which could be more suitable for you and so you should contact the not-for-profit organisations others have mentioned for further advice. If you do ring up or go and see an adviser make sure you have up to date letters/statements handy which show how much is owed as this will help the adviser get a clear picture of your position. There is so much advice out there and so much more I could add but I've gone on too long already.
You're by no means on your own and nobody will judge you. As others have said counselling to help you deal with the reasons why could be really helpful otherwise the debts could carry on spiralling. You've done so well in facing up to it so far. Take a deep breath and go through it all properly - it will be such a huge relief for you!! Good luck with it all