I am also Chabad. Like all of us, I was totally devastated on that Gimmel Tammuz 24 years ago. Just as Hashem stopped the sun for Yeoshua to win the battle on THAT Gimmel Tammuz, so too will Hashem allow our sun to continue. Each day we all daven for Moshiach and pledge that we KNOW that we will see techis hamaisim in shmona esrei.