Posted too soon..
Is your DM the kind of person you can have an honest conversation with? If so, Say what you have said here, and explain that you feel your parenting is being judged and criticised. I have a feeling that might not be a conversation that you can have openly without drama, from what you have said here they sound really old fashioned, but if not it might help.
The advice given about here about getting benefits and getting out quickly- it’s well meaning advice but may be completely impractical and unrealistic right now (in the area of the country I am in, there is nowhere to rent and people in your situation who can’t find anywhere are sent to live in travel lodges for many months as ‘emergency accomadation’)
You have a roof over your head right now, that is the best situation you can hope for right at this moment, make a plan for the future but don’t panic, you can make this work even though it is hard.
Is your parents house quite big? Does your toddler have nursery hours? If so he will be back into his routine soon and you will have a breather too (and your parents will have a break from being with a toddler, as they are not used to it)
You can do this. Whatever you do, don’t go back to your ex just because this feels too hard… keep moving forward.
It might be a case of putting one foot in front of the other for a while, on a second to second basis - just keeping reminding yourself “one foot in front of the other, you can do this” as often as needed. Keep going and eventually you will come out of the other side - it’s like going through a thick fog and not knowing where it will end, but just keep trusting that it will and there will be a point where suddenly it will clear, you will have a new life and the worst will be over 💐