L.S.
I know that this is no practical help whatsoever, but...
Yes, toddlers go through phases like this, particularly if they're on the verge of a big developmental thing. When my older one was doing the whole verbal explosion stuff... whew... those were some rough evenings. But he grew out of it after a few weeks. It just took some economy-size patience from me (toward the baby) and from my husband (toward the weepy mess that I was). Plus some serious compassion for the poor kid who was too busy learning and practicing to waste time sleeping.
Hold on, honey. This too shall pass...