There is a segula1 from the Ramban for after lighting the Chanukah lights to say the verse from Psalms: "May the graciousness of the L·rd our G·d be upon us," (Psalms 90:17) repeating each word seven times. This is very good to do.

My Master, the Baal Shem Tov, told us to say both this Psalm and Psalm 91, "He who dwells in the covert of the Most High" seven times straight. He would also do so on the High Holy Days, and in all times of trouble.

One should meditate on two letter nun's.

[From The Siddur of R. Shabsai; translation and Commentary by Rabbi Dr. Eliezer Shore. Reprinted with permission from the e-mail series: The Baal Shem Tov Times