The only constant is change.
Say that aloud, believe it. Because it is the truth. Learn to see the benefit of change. Nothing stays the same, without change we could never progress, we become stagnant and entropy sets in.
I find that by planning for change I feel more in control. Regardless of whether I put the plans into effect or not. It is the act of creating them that I find solace and in this solace is peace and I am freed from anxiety.