Excellent. Please do come back and let us know when you've made that appointment. You've already achieved something positive this past week by going to your GP for medication. A referral, and maybe some Diazepam in the meantime, may help too- hopefully your GP will have some ideas.
Next thing is the CAB. You'll feel better once you know where you stand- so stop avoiding it. Call and make an appointment. It can take a while to get one, so setting a time now isn't so scary- it might well be a fortnight off, giving you time to work up to it in your own way.
Time to scrap the mantra, no? Get angry with your Mum (if you're not already) and find that line of separation between her crp and yours. Then you can change the crp that belongs to you and leave her with hers. Hope that makes some sort of sense!
DH... what can I say. Not much that hasn't been, I think. He sounds resentful, and childish. Whether he's simply a dickhead or it's more along the lines of MyNameIs's post, only you can possibly know. Might be worth asking him to go and stay with his mum for a while, either way, as it doesn't seem to be helping either of you having him around.
Not sure whether the rota will help just now, it could be another stick to beat yourself with. I think you need to focus on some good things, some positive, rewarding things. Maybe just simplify it- sort out one room each day, and reward yourself with something nice, even if it's just a walk to the park with the kids to feed the ducks..?