I really feel for you, especially because you say you are still struggling with PND from your first. As someone who has a history of (severe) depression, has had one cs (long story but it was a positive experience) and am likely to have a second cs in nov I get all of your up and down emotions.
As well as trying all the stuff to get bub to turn I would suggest getting some help now for your PND. That way hopefully which ever way your beautiful baby enters the world you might find it less stressful and more poditive if you are feeling more yourself.
Take care and go easy on yourself xxoo