I am so sorry you are having all these issues
I might have a solution to the leaking nappies. I think Huggies changed the way they make up the nappies ie they use a cheaper material now and they are not as absorbant. They were leaking all the time with DS, even after a 3hr nap. I swapped to babylove and we have had no issues! Perhaps try another brand? You can get free samples sent out to you to try out before you buy a whole pack. Also going up a size can help.

HTH