Try not to be disheartened, I know it is difficult as you feel you are never going to improve but you will do. As I said each persons journey is slightly different but there are common threads along the way.
I do remember having a mild depression after about 9 days onwards and felt not good at all from a mental point of view – but my mood slowly lifted after about 10 days and I can honestly say that I now feel my normal.
I am unfortunately furloughed from work and have been since the beginning with the threat of being called back to work at any moment which isn’t conducive to a stable mind set! But it is what it is and things will stabilise in that area soon.