Quack Quack Quack.
To answer your question directly I felt a LOT of relief of no longer having to live my minute to minute life in the same house as an A. Relief at being able to move around my house without wondering where he was so I could avoid him, relief of a load of resentment for walking around him all the time. Relief at not having to hide $ etc. etc.
Serenity is a different thing and others explained it well and I'm still working on it.