Hi emmas.......... I know exactly how you feel. I had 5 months of maternity leave & in my 3rd month I realised that I need to start looking for a nanny as there was no way I was sending my daughter to a creche will so small.
I managed to find a lady that I felt reasonably comfortable with & she started while I still had about a month of leave left but during that time I wasn't comfortable with her anymore & felt like she wasn't capable of looking after my daughter & I also didn't wanna go back to work. So, what did I do.......... I had to return the Monday in March & I gave 24 hours notice the friday he he he. I was lucky enough to be able to stay with her a little longer as my husband started a new job where he got a car allowance. So, we sold our car & he bought himself a new one.
I was able to stay at home with my daughter until she was 19 month old!!!!!!!!!! It didn't make it any easier when I finally had to start looking for another job & a creche

It was absolute hell the first few weeks. I cried every single day & couldn't get to her fast enough in the afternoon.
I don't have advice cause times are tough & not everybody can afford to stay at home. Maybe speak to your dr about prescribing a relaxer or something.
Good luck!!!