To me, calm contentment is just about feeling fine, not letting the world get to you even just for a short period of time, and staying calm. I've been feeling this way ever since I returned from Italy about two weeks ago, but the other day I lost it. I thought it was lost forever. I thought that if I lost my state of calm contentment that I could never get back to it, but I’ve realized that it’s not something that you can forget. You may lose it, but it can always be found. Once you've experienced it, you can't forget it, and therefore you can always find your way back. I'm probably not making much sense at this point, but I thought this was something important that I should share.
TL;DR: It's okay to lose your shit sometimes, but just remember that there is always a way back to calm contentment.