What is the best approach to helping an anxious child?

"What is the best approach to helping an anxious child? We have a (nearly) 7yr old boy who is social, intelligent, happy and very loved. He is an extremely sensitive child with a huge capacity for empathy. He is a deep thinker and has a type A personality. He has a tendency towards feeling nervous (eg. 1. scared to be alone overnight despite sharing a room with a sibling, eg.2 doesn’t want to go back to a certain shul where an older child was once nasty when he spilled a cup of water by mistake). Regarding night fears, we talk about Hashem’s love for us and how Hashem runs the world and everything is perfectly as it should be and there’s nothing to worry about etc etc. This relaxes him somewhat but does not seem to resolve his fears long-term. How should one approach the day-to-day nervousness of a sensitive intelligent child? How can we build more resilience? Thank you very much!" Rabbi Kelemen responds.