OP, my heart goes out to you 
You have obviously been completely ground down by this man and he's knocked all of the stuffing from you.
However, none of the problems you have are insurmountable 
If I were you, the first thing I would do would be to ring Women's Aid. They exist precisely to help women in your situation - do bear in mind that the most dangerous part of an abusive relationship is when you try to end it, so give them a ring, pour it all out and let them help you to make a plan. You do not need his permission to end the relationship (so you don't need to have exhausting conversations that go round in circles) nor do you need to give him a reason (I certainly wouldn't attempt to explain to an abuser that they are abusive), WA can help you with how to handle it. Try Googling for the number of your local branch, they are often less busy than the national phone number.
Do you think your mum would help you if you explain you're ending the relationship with him? Or your friends, if a friend of mine who had blanked me got in touch and explained it was due to a controlling partner who they wanted to leave I would drop everything to help. If neither family nor friends are an option (or in addition to them) you can ask to speak to the domestic violence team at your local police force who may be able to send officers round to be with you while you tell him to leave. If you tell them about his abuse of you they may be able to enforce something to keep him away from you. But discuss all of this with WA, these are just possible ideas but they can help you work out the safest plan for you.
It is extremely expensive for a landlord to evict a tenant and takes a very long time, you may find that your landlord would be willing for you to stay if you are able to demonstrate your ability to pay the rent on time from now on while also paying off the arrears you have built up (presumably you could afford to do this once you are out of the relationship?). Someone like CAB may be able to advise you on this. I imagine your landlord just wants the rent paid reliably and the property looked after so if you explain that you've ended an abusive relationship and now have full control of your income and can afford £X per month on top of the normal rent to pay off the arrears then they may go for that rather than pushing through the eviction which is not an easy route for them.
Either way you will be significantly better off financially (and in other ways!) without this man dragging you down. Contact CAP (Christians Against Poverty) about your debts, you don't have to be a Christian and they won't push it on you, they just believe that as Christians they should help. They can make a budget with you to help you calculate how much you can afford to put towards debt repayments every month (they won't leave you with no disposable income) and they can speak with all of you creditors on your behalf (so that you don't have to). There will be a way to deal with your debts and as with all of the other issues you are facing you don't have to do it alone, there are people who will advise, help and support you but you need to reach out and ask them
Imagine, come the new year you could be relaxing in your own home without him creating an atmosphere, chatting on the phone with an old friend knowing that your debts will be paid off by X date and that you don't have to worry about letters or phone calls in the meantime. Pick up the phone now and call Women's Aid, they are waiting to help you.