Barnabas, I agree with Dee.
The Miscarriage idea is a pretty serious excuse and may come back to haunt you down the road and cause you some more problems. Plus, it's complete farce and deep down you know it's not true, which may cause you some guilt and shame, which you dont need any more of.
You could say, you were dealing with some major personally issues (that you'd rather not share as it's embarrassing) and that your taking steps to deal with them. That might work.
Or you can just go full on honest about your struggles and see what happens. Some employers are very understanding, some aren't so much.
I wish you all the best