In all honesty very few people feel comfortable with constant change yet it is, ironically, the one thing that is constant in our lives. As hard as it is to do, the best way to deal is to accept and truly appreciate that each moment is temporary. That way you can revel in the wonderful moments and take comfort in knowing that the less than pleasant moments also will not last forever.
I’ve found many of the articles on this website to be very helpful in teaching me to live “in the moment” and “without attachment” which help me deal with changes as they occur.
I hope that helps you a little!