If you weren't a single mummy you would (in theory ) have time off, so OF COURSE you are entitled to it!

You know what, stuff what anyone else thinks. It's not their experience, its not their life, its no their sanity. If you need this, then you need it. Personally, I think you are doing the right thing by giving yourself some time to yourself, especially since you have diagnosed depression. How can you care for your two little cherubs if you won't even care for yourself.

Do it, know you are doing the right thing by your whole family, and chuck that guilt out the window.