Hi Mammy. I'm also in Ireland so some ireland-specific info-
Accord, as far as I'm aware, are the catholic marriage counselling service. I'm horrified they might have suggested you stay. Womens Aid 100% would not do that and I'd really suggest you give them a call- 24 hour helpline, you could do it at lunchtime if you want privacy. If you're near Dublin you could make an in-person appointment or they could give you contact details for local DV services if you want to see someone face to face. Free legal aid and all the rest- can be great, but often dont fully understand the dynamics of an abusive relationship.
That being said, I'd be wary about going ahead with mediation when there's been abuse. I'd also consider whether you want to look into getting a safety order, and whether that would be helpful or not- again, WA can talk you through. In some ways, it might be useful to have a record of some of the incidents that have occurred in case they become relevant.
Finally, it's 100% possible to go bankrupt in Ireland, there was a huge reform of the rules around the crash that made it easier. There would be knock on effects re getting a mortgage in future. Talk to MABS, explain you're planning on separating, that the relationship has been abusive, you're worried about debt/financial entitlements/etc etc. They should be helpful.
Also: consider honestly if you might want to move closer to family and support. Rural ireland can be a hard place to go through situations like this: the understanding of local gardai varies hugely- sometimes they're amazing, sometimes they're awful- and it may be that your neighbours and friends will rally around but if you're in his home place it may go differently.
And finally: good luck. The next bit is so important in terms of keeping yourself safe, but you have made absolutely the right choice. I really think you'll look back on this moment and feel very happy and proud.