Firstly it doesnt sound a pathetic post and here's a very un-mumsnet like
You sound like me a year ago. I prob had (still have PND) but have been totally stubborn in acknowledging it and have dragged myself kicking and screaming out of my hell hole my making a little routine during the week. It prob wont suit you but a least give you a few idea.
mon - we used to go to softplay for an hour between 10 and 11 which took care of the morning and then we were home for lunch. DS1 was so knackered he slept for a couple of hours by which time it was 3pm, had an hour of cbeebies and then it was time to start preparing tea. since met a friend at soft play so this has been replaced with meeting her
tues - rhyme time in the library at 10:45 and then see above for rest of the day
wed - nursery day and mummy time
thurs - go and visit elderly FIL and then see monday for afternoon
fri - food shop in morning and if nice, walk to local park and swings in afternoon.
Its not very exciting but it did keep me going.
as far as diet goes, my boys love pasta in any shape or form. same goes for sausages. baked beans are a good standby. you could microwave a potato and grate cheese over it. There are lots of simple nutritious meals that toddlers love.
Dont worry about the housework initially. It will all come together when you have move energy & motivation. I put a load of washing on every evening when my two go to bed, hang it on the airer about 8pm and its dry by the morning. I do this every night and this keeps on top of it.
lastly, remember mumsnet is always here for advice, help and to sound off.