Before reading other comments I feel the need to put my thoughts out first.
Awesome how you can put your feelings into words. To me it is a sign that you are deaccelerating at some time and then realize it explictly. You may spot yourself reflecting on thr things you just done. Probably you developed to realize this emotion due to good parenting - would be my guess.
You would call this state inner balance but in English this isn’t very percise. Ausgeglichenheit explictily includes the mental state. The jucking things in your body may simply be happiness. The clearance in your mind - since you can remember it vividly - is your good attitude.
But I have no idea and just guessing from my gut. Bet there are other valid opinions and stances within here. Anyhow I wouls try to preserve it by going to a yoga class twice a month.