I'd second checking out Pinky's advice. We used the bouncer for day sleeps early on too.

It also sounds like pretty classic Wonder Week behaviour - week 5 is the first WW. I have found this book to be invaluable in explaining the sudden changes babies go thru when you think WTF!!! Just when I had it sorted!! It helps to see that it's normal and that you'll get thru it. Hang in there. :hugs: