Hi superfrenchie
Hope you are well and had a reasonable time on your trip for work today! Firstly, you are doing so much! Please be proud of how much you have done.
Ok, and please feel free to tell me to sod off if you read this...
Relationships. I don't think the contact you're facilitating is going to be doing your children any favours long term, sorry. Watching dad speak to mum the way he speaks to you must be messing with their heads. Smelling their breath to see what they've eaten? This really isn't normal. But you're normalising it. You take them there, you take his shit, you cook his tea, you do bath and bed. I think 'putting the kids first' is a bit of a red herring sometimes. I know the contact order will cost, but it will be money well spent if it gives you back your freedom and dignity. You can't move on and find yourself and then another relationship if you're round his house, playing families, as you will never have the time or energy. Breakfast club/ childminder/ bit of cash in hand for a similar mum would be money well spent so you are not relying on him for anything practical. Counsellors can offer cheaper sessions if you ask and explain your situation. Or get on the GP's waiting list. You need some support to see that you're worth more than this awful treatment.
Work. If your manager's off long term sick is their workload falling to you? If so ask for help or extra money for the extra responsibility or don't do it at all. Many years ago I made myself very ill by working through an illness as my manager was off sick and I didn't want to let people down. I would never do it again and I would advise anyone else in a similar situation to not take on extra and to speak to senior management.
Home. (I absolutely love cats btw). You say you took the cat in for a friend. If this friend is so good that you'd majorly inconvenience yourself in cat terms why isn't s/he helping you now? If you can't bring yourself to get rid of the cat then go to the vets and ask for a program injection. It puts a chemical in the cats blood that the fleas drink and then the larvae in the eggs they lay can't create a strong skeleton so they can't hatch. Fleas can't live on human blood so they would die off in a couple of weeks. After a massive flea breakout a few years ago we haven't had one since we got the injection.
Money. Get some help. If your parents are rich and not total sods would they consider a loan? We did this with mil, we paid her back plus more interest than she would have got for savings, but less than we would have paid with a bank loan. If you go on money saving expert there's loads of advice of what to do if you can't pay creditors.
I think the easiest thing to sort would be the fleas with a program injection. I think the money sorting would take a day or two and lift a huge weight off your shoulders. I think the problem that if sorted, would give you time and energy to do the rest, is your ex and the contact you're facilitating.
Best wishes :)