Change will always happen; time ticks on, seasons change, people move and generally things just happen.
Sometimes no matter how at peace you are, some sort of change can occur that disrupts (or seems to) disrupt everything. Change can be good, but when it’s unexpected this is when you should take some times to yourself and remember to breathe.
In fewer words, don’t loose your cool.
However you decided to keep your cool, the important thing is to take your mind off whatever just occurred. Personally I take 5-10 minutes to meditate, I close my eyes, take a few deep breaths and take that time to appreciate life, appreciate the good times. The good times I’ve had and the good times I will have.
There is nothing wrong with reminiscing or being excited for what is to come, just remember that change will always occur in life, some you will be looking forward to and others you won’t see coming, remember to take time out to breathe through it all.
Don’t let it linger in your thoughts, remember you need to sort out going on your next adventure.