My little one is 20 weeks and at the moment is much the same as your little one.

The others are right in saying that 19 weeks can be a doozie wonder week. But also, it sounds like he's had a lot of upheaval of late so might just need a few weeks to get back into a pattern that you're all happy with.

The No Cry Sleep Solution by Elizabeth Pantley offers some wonderful gentle solutions to help night time sleep. Would totally recommend that book.
Sue xxx