Prayer and advice for Sadness
Only what exists and is grounded is shown here. We do not add items just to fill every step.
1. Advice from Rabbi Nachman's teaching
2. Documented segula
A segula is not a promise of a result. It is brought here as written in the source, for study and prayer.
As written in the source
Hearing the sound of a melody on a musical instrument from an upright musician who plays for the sake of Heaven is a great segulah for joy, and for subduing and clarifying the imaginative faculty. And through this one merits memory, to cleave one's thought to the World to Come, and to understand the hints that God, may He be blessed, hints to him every day to draw close to Him. Also through the melody and joy mentioned above one can attain the aspect of a spirit of prophecy, the holy spirit (ibid., §6).
View original Hebrew
שְׁמִיעַת קוֹל נִגּוּן עַל כְּלִי זֶמֶר מִמְּנַגֵּן כָּשֵׁר לְשֵׁם שָׁמַיִם הוּא סְגֻלָּה גְּדוֹלָה לְשִׂמְחָה, וּלְהַכְנִיעַ וּלְבָרֵר הַמְדַמֶּה. וְעַל־יְדֵי זֶה זוֹכֶה לְזִכָּרוֹן, לְאַדְבָּקָא מַחְשַׁבְתָּא בְּעָלְמָא דְּאָתֵי, וּלְהָבִין הָרְמָזִים שֶׁהַשֵּׁם יִתְבָּרַךְ מְרַמֵּז לוֹ בְּכָל יוֹם לְהִתְקָרֵב אֵלָיו. גַּם עַל־יְדֵי נִגּוּן וְשִׂמְחָה הַנַּ"ל יְכוֹלִין לְהַשִּׂיג בְּחִינַת רוּחַ נְבוּאָה רוּחַ הַקֹּדֶשׁ: (שם אות ו')
ליקוטי עצות · שמחה · קטע י״ד A segula is not a promise of a result. It is brought here as written in the source, for study and prayer.
As written in the source
One should ask God, blessed be He, that he may have yearnings and longings for the Land of Israel until he merits to come there, and also that he may have longings for all the tzaddikim, to the Land of Israel. This is a special remedy for nullifying anger and sadness, as mentioned above. (ibid.)
View original Hebrew
וְצָרִיךְ לְבַקֵּשׁ מֵהַשֵּׁם יִתְבָּרַךְ שֶׁיִּהְיֶה לוֹ כִּסּוּפִים וְגַעְגּוּעִים לְאֶרֶץ יִשְׂרָאֵל עַד שֶׁיִּזְכֶּה לָבוֹא לְשָׁם, וְגַם שֶׁיִּהְיֶה גַּעְגּוּעִים לְכָל הַצַּדִּיקִים לְאֶרֶץ יִשְׂרָאֵל, וְהִיא סְגֻלָּה לְבַטֵּל הַכַּעַס וְהָעַצְבוּת וְכַנַּ"ל: (שם)
ליקוטי עצות · ארץ ישראל · אות ט״ו A segula is not a promise of a result. It is brought here as written in the source, for study and prayer.
As written in the source
5. A segulah to remove sadness: through compassion.
View original Hebrew
ה. סְגֻלָּה לְהָסִיר הָעַצְבוּת עַל יְדֵי הָרַחֲמָנוּת.
ספר המידות · עצבות · חלק שני · אות ה׳ A segula is not a promise of a result. It is brought here as written in the source, for study and prayer.
3. For any need: prayer in your own words
A general alternative, not a dedicated match for this topic: Rabbi Nachman teaches to speak with God in your own words about everything.
4. Go deeper with your Study Partner
Ask in your own words, and get a reasoned answer from the sources.