That sounds so tough OP.
My first thought would be to speak to Citizen Advice and/or a debt charity about the money issues so they can help you put a plan together and help liaise with creditors.
Your husband has walked out: are you divorcing? what are the financial arrangement for this? who is getting the house? get legal advice.
I would also speak to your GP if you feel like you are reached a point where you are depressed and have problem sleeping/functioning.
Are there any family members that can support you with your father?
I had an incredibly tough time last year ( a combination of long term health issues, assault, having to move to a completely new town and problems with my new property, work not being supportive when I had time off after a complete breakdown, family estrangement, basically it was relentless...).
I think what helped was to admit that I was struggling and start getting support from my GP, the mental health crisis team and Citizen Advice and trying to deal with each problem one at a time. A couple of friends also really stepped up and regularly checked on me when I was at my worst after I admitted to them how much I was struggling.
I am much better a year on but at the time I really could not see the light at the end of the tunnel!
I also found that listening to 10 minute guided meditation on YouTube to start each day helped with my anxiety and also writing my thoughts in a diary every day, no matter how messy they are :). I also started a little blog to share my journey out of that hole:
https://greenmermaidcottage.blogspot.com/search/label/About%20me