IME, it works much better when I try to resolve one thing at a time and totally ditch all the guilt about the other things. I think what happens often with the poor executive function in ADHD is that we have no systems for anything so everything is a total and utter mess and it is all tangled up in a big pile so making progress on one thing doesn't feel like progress because the overall pile is still overwhelming. And/or we try to make progress on everything at once and that is ineffective, all of this then feeds into stress/guilt/feeling that we can't stick to anything.
You say that you have a few stressors you are trying to resolve - is that this list, or are they separate from it?
Are you on medication for either the ADHD or anxiety? Is that something you'd like to explore at all?
Out of your list, I think I'd probably pick either sleep or debt as the first "unsolved problem" - which one feels more realistic to tackle first and/or which would have the greater effect on your day to day life? Would clearing debt free up more money in your budget, for example? And do you have multiple debts, or just one?
Ditching guilt about the others would mean not worrying about what you eat for now, in the knowledge that you will get to this at some point later. Just eat what you feel like eating/drinking, or get in plenty of drink alternatives and allow yourself one sugary drink per day (but again don't worry about this/beat yourself up if you have more - it's on the backburner right now!)
Fulfilling your basic obligations at work, doing whatever is your current routine, not particularly trying to improve there for now.
I'm sure you are a good mum to your toddler so don't beat yourself up about bad days/hard days. We all have them.
I have not struggled with health anxiety myself, so not sure what letting this one go would look like - other than to simply say OK, yes, I feel anxious, that's OK, that's where I am right now. And try not to beat yourself up about feeling anxious, if that makes sense? Or do whatever helps, even if you know it's a bit OTT/unhelpful.